If you’re already signed up, you will need to be logged out to access the “for fun” games. Keep in mind that not all games have the “for fun” feature, but most do.
To try a game in “for fun” mode with a fun-money balance that is provide, simply click the “INFO” button on the game you wish to play while not logged in.
Then click the “TRY GAME” button beside the “PLAY FOR REAL” button. Voilà!