After you add a team to a competition, you need to select the players who will play in the competition.
From Competitions, select Team Setup.
Click on the name of your team.
Click on the Competitions tab. This should list all the competitions your team is in.
Click the Attach Team Members to Competition button next to the name of the competition.
A list of available members is on the left. Tick the box next to the names of the members you want to add.
Click Add to Competition.
The names will move to the right side. Click Save.
These members are now available to play in the competition.