Update doc

README.md

@@ -61,6 +61,35 @@ docker compose up -d
 
 To change these later, go to **Setup** as admin.
 
+## Admin Page (`/admin`)
+
+The admin page provides full management of the webconsole. Only users with the **admin** role can access it.
+
+### User Management
+
+- View all users with their role, status, last seen, and last TX timestamps
+- Create, edit, disable, or delete users
+- Reset user passwords
+- Three roles: **admin** (full access), **user** (TX/RX), **guest** (RX only)
+- Safety: cannot delete yourself or the last remaining admin
+
+### SDR Settings
+
+- **PlutoSDR IP** — IP address of the Pluto (default: `192.168.6.122`)
+- **LNB LO Frequency** — exact local oscillator frequency in Hz (e.g. `9749971700` for a Bullseye TCXO)
+- **S-Meter Offset** — calibration offset from dBFS to dBm
+
+Changes trigger a reconnect to the SDR bridge.
+
+### TX Lock
+
+A global transmit lock that, when enabled, blocks all users from transmitting (PTT, two-tone, etc.) and stops any active transmissions.
+
+### Activity Log
+
+- Paginated log (200 entries per page) of all user activity
+- Filterable by user and event type (login, logout, TX start/stop, disconnect, etc.)
+
 ## Networking: Reaching the Pluto
 
 By default Docker uses bridge networking. If the Pluto is on a separate Ethernet interface the container can't route to, use host networking (Linux only):