The console
- In TF2, open Options, Advanced, and tick Enable developer console.
- Press the ~ key and type: connect <address>:<port>
- If the server has a password, type password <password> first, or answer the prompt.
The Community Server Browser
Play Multiplayer, View Servers, then the Internet tab: search for the server's name. A server appears there only when it logs in with a Steam Game Server Login Token.
Steam favourites
In Steam, View, Game Servers, Favorites, Add a server, with the same address and port. The server is then one click away from Steam and from TF2's Favorites tab.
Frequently asked questions
Why can I not find the server in the browser?
It needs a Steam Game Server Login Token to be listed. Until it has one, join with connect and the address.