The screen at the right allows you to select a team to score.  Click on the team you wish to score.

In addition to useful information about the team, there is an icon in the left column that indicates the status of the team:

the team is scored and submitted

the team is scored but not submitted

the team is partially scored

the team is unscored

Submitted is the equivalent of sending your scores to the Score Room as you can't edit them once they are submitted.

However, much like you can get your scores back if you need to, your scores can also be unsubmitted by the Score Room, your HA or your ATO.