Most leagues and tournaments on the platform require players and teams to self-report their scores. If you join a competition with this requirement, make sure you return to your Match Lobby to report the score following your match completion.
Don't forget the most important step - Report Your Results! After you complete your match, return to the Match Lobby in order to report the score and update the standings. Take a picture of the end-game results with your phone and upload to the site as proof of the game.
If your opponent was great, don't forget to leave them a review! Likewise, if you feel you need to report something that your opponent was doing wrong, you can report that information to the admins here.