Step 1:
From the Dashboard, Select "Club Management" followed by "Teams" here in the top tabs you will select "Teams", scroll down and Click "Roster Builder"
Step 2:
Here you will select your "Event" and hit submit.
Step 3:
Once here, you will click and drag the hairpin icon next to the players name to the team you would like to roster them on.
Note: All the players on the team currently have green checkmarks that signify approved.
You will now see that player on the team with a Yellow Triangle next to his name since he was just added and has not been approved yet.