Simply go onto the 'Road to Rio' ONLINE game mode, and try to win a match.
As you start in the first stadium, most of your opponents should either be new to the game, or be bad enough at the game to not be able to progress.
Try and play with a high tempo, passing quickly, and you should eventually win a game.
If you are struggling, this can be boosted with someone else who is within 2 cities of you, using restrictive matchmaking settings and low star teams. Just have them quit the game and you will be awarded the win.