Go to your game panel, find "query info" e.g. 188.72.167.35:15502
Open the game
Click "Server Manager"
Click "Add Server"
In the IP field, type your IP found before the : in your query info e.g 188.72.167.35
In the port field, type the port found after the : in your query info e.g. 15502
Press "Add"
Now you've claimed your server you can manage it from within the game.