To add any new players to the roster during preliminary play, you must visit the Tournament Office and sign the player(s) in.
If you are a team admin and need to add to your roster, please review this article: How to Add Players to Your Team Roster
Rule Note:
Teams will not be permitted to add any new players once preliminary games have concluded. All players must play at least one round robin game to be eligible for your team’s post preliminary games. Any ineligible players will be removed from the tournament.