Once you want to know the Address:Port, go to My Servers > Details.
Here you will find the Address:Port needed in the game:
To connect to the server:
- Run the game
- Click “Join”
- Skip server selection screen
- Click “Connect to IP”
- Use Address (as IP) and Port from your web panel
- Click: “Connect”
Next time you will be available to find your server on the in-game servers list. Server address and port are also remembered in the “Connect to IP” window.
Don’t use the servers list directly from Steam.