You can add another game on the Rivals page, as long as your plan has room for it. The number of games of your own is 1 on Free, 1 on Indie and 5 on Studio.
- Open Rivals.
- Under Your games, paste the Steam store link or app ID of the next game.
- Click Add game.
To move between your games, use the game switcher in the sidebar, or at the top of the screen on your phone. The game you pick stays picked on every page until you choose another.
To make room, remove a game under Your games. Its rivals and alert rules are removed with it.
Tip: working on several games at once? Studio gives you room for 5 games with 100 rivals each.