If you have internet, there should be a list of server starting to appear on the bottom half of the screen. Click one of the servers, and "IP ADDRESS PORT" will fill itself up automatically.
Thank you for helping me. My wifi wasn't working yesterday properly which is probably why it didn't work.
Can you try manually connecting to this address to the main server? Also make sure you give yourself an unique name before logging in to avoid issues. 188.165.244.152:5080 If that doesn't work it might be your WiFi Firewall settings.