The app asks for a tunnel name — give it a clear one, the country for example, and tap “Create tunnel”. The tunnel appears in the list on the WireGuard main screen: its name on the left, a switch on the right. Turn the switch on — Android asks once for permission to set up a VPN, tap “OK”. When connected, a key icon appears in the status bar; turn the same switch off to disconnect. Add a few servers this way so countries can be switched right in the app.
To avoid picking servers blindly, use our Radar service — radar.rvpn.online: it shows which servers are up right now and how fast they respond (sign in with your VPN login and password).