The server should normally appear in the in-game server browser. First check the browser filters. If it is still missing:
- Open Steam.
- Open View > Game Servers.
- Select Favorites.
- Click Add a Server.
- Enter the IP address and Query Port shown on the server's main management page.
- Search for the server and add it to Favorites.
- Refresh the list.
- Select the server and connect.
The server should then remain available under Favorites and History.