diff --git a/src/auth/AuthContext.tsx b/src/auth/AuthContext.tsx
index b6da71b..ca5d3e2 100644
--- a/src/auth/AuthContext.tsx
+++ b/src/auth/AuthContext.tsx
@@ -2,7 +2,7 @@ import { useMemo, useState } from 'react'
 import type { PropsWithChildren } from 'react'
 import { clearAuthSession, getAuthSession, isAccessTokenStale, setAuthSession } from '../lib/auth-storage'
 import type { AuthSession } from '../lib/auth-storage'
-import { loginCenter, logoutCenter, refreshCenter } from '../lib/center-auth-client'
+import { loginCenter, logoutCenter, meGuildsCenter, refreshCenter } from '../lib/center-auth-client'
 import { AuthContext } from './auth-context'
 import type { AuthContextValue } from './auth-context'
 
@@ -45,6 +45,33 @@ export function AuthProvider({ children }: PropsWithChildren) {
         setSession(next)
         return next.accessToken
       },
+      refreshGuilds: async () => {
+        if (!session) return
+        let accessToken = session.accessToken
+        let refreshToken = session.refreshToken
+        let tokenType = session.tokenType
+        let expiresIn = session.expiresIn
+        if (isAccessTokenStale(session.accessToken)) {
+          const refreshed = await refreshCenter(session.centerApiBase, session.refreshToken)
+          accessToken = refreshed.accessToken
+          refreshToken = refreshed.refreshToken
+          tokenType = refreshed.tokenType
+          expiresIn = refreshed.expiresIn
+        }
+
+        const guildData = await meGuildsCenter(session.centerApiBase, accessToken)
+        const next: AuthSession = {
+          ...session,
+          accessToken,
+          refreshToken,
+          tokenType,
+          expiresIn,
+          guilds: guildData.guilds,
+          guildAccessTokens: guildData.guildAccessTokens,
+        }
+        setAuthSession(next)
+        setSession(next)
+      },
     }),
     [session],
   )
diff --git a/src/auth/auth-context.ts b/src/auth/auth-context.ts
index 51c816e..243e7ec 100644
--- a/src/auth/auth-context.ts
+++ b/src/auth/auth-context.ts
@@ -7,6 +7,7 @@ export type AuthContextValue = {
   login: (centerApiBase: string, email: string, password: string) => Promise<void>
   logout: () => Promise<void>
   ensureFreshToken: () => Promise<string | null>
+  refreshGuilds: () => Promise<void>
 }
 
 export const AuthContext = createContext<AuthContextValue | null>(null)
diff --git a/src/index.css b/src/index.css
index d87cb54..bc7c327 100644
--- a/src/index.css
+++ b/src/index.css
@@ -152,6 +152,31 @@ a:hover {
   gap: 8px;
 }
 
+.modal-backdrop {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.45);
+  display: grid;
+  place-items: center;
+  z-index: 30;
+}
+
+.modal-card {
+  width: min(560px, 92vw);
+  max-height: 80vh;
+  overflow: auto;
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: 12px;
+  padding: 14px;
+}
+
+.modal-list {
+  display: grid;
+  gap: 8px;
+  margin-top: 8px;
+}
+
 .list-btn {
   width: 100%;
   text-align: left;
diff --git a/src/lib/center-auth-client.ts b/src/lib/center-auth-client.ts
index 3a7580b..1f3b6fd 100644
--- a/src/lib/center-auth-client.ts
+++ b/src/lib/center-auth-client.ts
@@ -20,6 +20,11 @@ type RefreshResponse = {
   expiresIn?: number
 }
 
+type MeGuildsResponse = {
+  guilds: Array<{ nodeId: string; name: string; endpoint: string; status: 'active' | 'offline' | 'revoked' }>
+  guildAccessTokens: Array<{ guildNodeId: string; token: string; tokenType: string; expiresIn?: number }>
+}
+
 function centerClient(centerApiBase: string) {
   const client = axios.create({
     baseURL: centerApiBase,
@@ -49,3 +54,30 @@ export async function refreshCenter(centerApiBase: string, refreshToken: string)
 export async function logoutCenter(centerApiBase: string, refreshToken: string): Promise<void> {
   await centerClient(centerApiBase).post('/auth/logout', { refreshToken })
 }
+
+export async function meGuildsCenter(centerApiBase: string, accessToken: string): Promise<MeGuildsResponse> {
+  const res = await centerClient(centerApiBase).get<MeGuildsResponse>('/auth/me/guilds', {
+    headers: { Authorization: `Bearer ${accessToken}` },
+  })
+  return res.data
+}
+
+export async function joinGuildCenter(centerApiBase: string, accessToken: string, guildNodeId: string): Promise<void> {
+  await centerClient(centerApiBase).post(
+    '/auth/me/guilds/join',
+    { guildNodeId },
+    { headers: { Authorization: `Bearer ${accessToken}` } },
+  )
+}
+
+export async function guildMembersCenter(
+  centerApiBase: string,
+  accessToken: string,
+  guildNodeId: string,
+): Promise<Array<{ userId: string; email: string; status: string }>> {
+  const res = await centerClient(centerApiBase).get<Array<{ userId: string; email: string; status: string }>>(
+    `/auth/guilds/${encodeURIComponent(guildNodeId)}/members`,
+    { headers: { Authorization: `Bearer ${accessToken}` } },
+  )
+  return Array.isArray(res.data) ? res.data : []
+}
diff --git a/src/pages/ChatPage.tsx b/src/pages/ChatPage.tsx
index d8b11cb..9f1d41c 100644
--- a/src/pages/ChatPage.tsx
+++ b/src/pages/ChatPage.tsx
@@ -2,6 +2,7 @@ import axios from 'axios'
 import { io, type Socket } from 'socket.io-client'
 import { useEffect, useMemo, useState } from 'react'
 import { useAuth } from '../auth/auth-context'
+import { guildMembersCenter, joinGuildCenter } from '../lib/center-auth-client'
 
 type MessageItem = {
   messageId: string
@@ -11,22 +12,24 @@ type MessageItem = {
 }
 
 type GuildChannel = { id: string; name: string; guildId?: string }
-type GuildRecord = { id: string; name: string }
-type GuildMember = { id: string; userId: string; guildId: string; status: string }
+type MemberItem = { userId: string; email: string; status: string }
 
 export default function ChatPage() {
-  const { session, logout } = useAuth()
+  const { session, logout, ensureFreshToken, refreshGuilds } = useAuth()
   const [selectedGuildId, setSelectedGuildId] = useState('')
   const [selectedChannelId, setSelectedChannelId] = useState('')
   const [channels, setChannels] = useState<GuildChannel[]>([])
   const [guildDbId, setGuildDbId] = useState('')
-  const [members, setMembers] = useState<GuildMember[]>([])
-  const [showGuilds, setShowGuilds] = useState(true)
-  const [showChannels, setShowChannels] = useState(true)
-  const [showMembers, setShowMembers] = useState(true)
+  const [members, setMembers] = useState<MemberItem[]>([])
   const [messages, setMessages] = useState<MessageItem[]>([])
   const [content, setContent] = useState('')
   const [newChannelName, setNewChannelName] = useState('')
+  const [joinGuildNodeId, setJoinGuildNodeId] = useState('')
+  const [selectedMemberIds, setSelectedMemberIds] = useState<string[]>([])
+  const [showCreateChannelModal, setShowCreateChannelModal] = useState(false)
+  const [showGuilds, setShowGuilds] = useState(true)
+  const [showChannels, setShowChannels] = useState(true)
+  const [showMembers, setShowMembers] = useState(true)
   const [loading, setLoading] = useState(false)
   const [error, setError] = useState('')
 
@@ -64,9 +67,7 @@ export default function ChatPage() {
     if (!guild || !guildToken) return
     setError('')
     try {
-      const res = await guildApi().get('/channels', {
-        params: guildDbId ? { guildId: guildDbId } : undefined,
-      })
+      const res = await guildApi().get('/channels', { params: guildDbId ? { guildId: guildDbId } : undefined })
       const list = Array.isArray(res.data) ? (res.data as GuildChannel[]) : []
       setChannels(list)
       if (!guildDbId && list[0]?.guildId) setGuildDbId(list[0].guildId)
@@ -77,20 +78,14 @@ export default function ChatPage() {
     }
   }
 
-  async function loadGuildMetaAndMembers() {
-    if (!guild || !guildToken) return
+  async function loadMembers() {
+    if (!session || !selectedGuildId) return
     setError('')
     try {
-      const guildRes = await guildApi().get('/guilds')
-      const guildList = Array.isArray(guildRes.data) ? (guildRes.data as GuildRecord[]) : []
-      const nextGuildDbId = guildList[0]?.id ?? ''
-      setGuildDbId(nextGuildDbId)
-
-      const memberRes = await guildApi().get('/members', {
-        params: nextGuildDbId ? { guildId: nextGuildDbId } : undefined,
-      })
-      const memberList = Array.isArray(memberRes.data) ? (memberRes.data as GuildMember[]) : []
-      setMembers(memberList)
+      const token = await ensureFreshToken()
+      if (!token) return
+      const list = await guildMembersCenter(session.centerApiBase, token, selectedGuildId)
+      setMembers(list)
     } catch {
       setError('Failed to load guild members')
       setMembers([])
@@ -128,6 +123,24 @@ export default function ChatPage() {
     }
   }
 
+  async function addGuild() {
+    if (!session || !joinGuildNodeId.trim()) return
+    setError('')
+    try {
+      const token = await ensureFreshToken()
+      if (!token) return
+      await joinGuildCenter(session.centerApiBase, token, joinGuildNodeId.trim())
+      await refreshGuilds()
+      setJoinGuildNodeId('')
+    } catch {
+      setError('Failed to add guild')
+    }
+  }
+
+  function toggleMember(userId: string) {
+    setSelectedMemberIds((prev) => (prev.includes(userId) ? prev.filter((x) => x !== userId) : [...prev, userId]))
+  }
+
   async function createChannel() {
     if (!guild || !guildToken || !newChannelName.trim()) return
     if (!guildDbId) {
@@ -136,9 +149,16 @@ export default function ChatPage() {
     }
     setError('')
     try {
-      const res = await guildApi().post('/channels', { name: newChannelName.trim(), guildId: guildDbId })
+      const payload = {
+        name: newChannelName.trim(),
+        guildId: guildDbId,
+        memberUserIds: selectedMemberIds,
+      }
+      const res = await guildApi().post('/channels', payload)
       const createdId = res.data?.id as string | undefined
       setNewChannelName('')
+      setSelectedMemberIds([])
+      setShowCreateChannelModal(false)
       await loadChannels()
       if (createdId) setSelectedChannelId(createdId)
     } catch {
@@ -147,7 +167,8 @@ export default function ChatPage() {
   }
 
   useEffect(() => {
-    void loadGuildMetaAndMembers()
+    void loadMembers()
+    setSelectedMemberIds([])
   }, [selectedGuildId])
 
   useEffect(() => {
@@ -186,6 +207,10 @@ export default function ChatPage() {
       <div className={`chat-top-grid ${!showGuilds ? 'hide-v1' : ''} ${!showChannels ? 'hide-v2' : ''} ${!showMembers ? 'hide-v4' : ''}`}>
         <div className="panel col-list col-v1">
           <h3>Guilds</h3>
+          <div className="row-wrap" style={{ marginBottom: 8 }}>
+            <input className="input" value={joinGuildNodeId} onChange={(e) => setJoinGuildNodeId(e.target.value)} placeholder="Guild nodeId" />
+            <button className="btn btn-secondary" onClick={addGuild}>Add guild</button>
+          </div>
           <ul className="list-reset">
             {guilds.map((g) => (
               <li key={g.nodeId}>
@@ -200,13 +225,7 @@ export default function ChatPage() {
         <div className="panel col-list col-v2">
           <h3>Channels</h3>
           <div className="row-wrap" style={{ marginBottom: 8 }}>
-            <input
-              className="input"
-              value={newChannelName}
-              onChange={(e) => setNewChannelName(e.target.value)}
-              placeholder="New channel name"
-            />
-            <button className="btn btn-secondary" onClick={createChannel}>Create channel</button>
+            <button className="btn btn-secondary" onClick={() => setShowCreateChannelModal(true)}>Create channel</button>
           </div>
           <ul className="list-reset">
             {channels.map((c) => (
@@ -244,9 +263,7 @@ export default function ChatPage() {
           <h3>Members</h3>
           <ul className="list-reset">
             {members.map((m) => (
-              <li key={m.id}>
-                <span className="muted">{m.userId}</span>
-              </li>
+              <li key={m.userId}><span className="muted">{m.email}</span></li>
             ))}
           </ul>
         </div>
@@ -259,6 +276,28 @@ export default function ChatPage() {
         <button className="btn btn-secondary" onClick={() => void logout()}>Logout</button>
         <button className="btn btn-secondary" type="button">Settings</button>
       </div>
+
+      {showCreateChannelModal ? (
+        <div className="modal-backdrop" onClick={() => setShowCreateChannelModal(false)}>
+          <div className="modal-card" onClick={(e) => e.stopPropagation()}>
+            <h3>Create channel</h3>
+            <input className="input" value={newChannelName} onChange={(e) => setNewChannelName(e.target.value)} placeholder="Channel name" />
+            <p className="muted" style={{ marginTop: 8 }}>Select members to include</p>
+            <div className="modal-list">
+              {members.map((m) => (
+                <label key={m.userId} className="row-wrap" style={{ alignItems: 'center' }}>
+                  <input type="checkbox" checked={selectedMemberIds.includes(m.userId)} onChange={() => toggleMember(m.userId)} />
+                  <span>{m.email}</span>
+                </label>
+              ))}
+            </div>
+            <div className="row-wrap" style={{ marginTop: 12 }}>
+              <button className="btn" onClick={createChannel}>Create</button>
+              <button className="btn btn-secondary" onClick={() => setShowCreateChannelModal(false)}>Cancel</button>
+            </div>
+          </div>
+        </div>
+      ) : null}
     </section>
   )
 }