Go to Settings > Network settings, and click the Edit beside Captive Portal. Configure with:
| Enable captive portal | Yes |
| Portal type: | Purple |
| Subnet | (choose a subnet) |
| Walled garden | Enabled - please refer to this list |
| Splash page URL | *insert access_url here* |
| RADIUS shared secret | *insert radius_secret here* |
| IP address or hostname | *insert radius_server here* |
| Authentication port | 1812 |
| Accounting port | 1813 |
| Backup IP address or hostname | *insert radius_server2 here* |
| Authentication port | 1812 |
| Accounting port | 1813 |
Click Save.
Next, go to Wi-Fi networks and add Add network. Configure with:
| Wi-Fi name | Guest WiFi (or whatever you wish) |
| Network security | Open |
| VLAN ID | (as required - matching the subnet VLAN above) |
The configuration is now complete.