Overview: The Roster Lock function is intended to prevent Team Officials from making any player additions or removals. Team Officials will still have full functionality to manage team game attendance, jersey numbers, positions and make edits to existing roster player's profiles.
Steps:
1. Go to the Set up tab for the specific Competition you are interested in.
2. Click on the Division (on the left side) that you want to lock. Then, set the Roster Lock Date field to a specific date after which you do not want Teams to be able to add/remove players.