Once your tournament is published, you can update the scores for games. To update game scores
Navigate to Events > Tournaments and select your tournament
Navigate to the Games tab
Click Set Score in the Actions column for each game
Update the score for the game and make sure the status is Completed. Hit Save when you're done!
You will see the game score update on the games list, the bracket will update, and these changes will also be reflected on your tournament's webpage.