Join Codes allow team captains to control who can join their team. These codes are configured in Admin Console in the team page management.
To create a Join code for a team page, navigate to Online > Peer-to-Peer > Team Pages and select the team page you wish to add a join code to. You will be able to add the join code on the Advanced tab.
Enter the code into the Join Code text box and click save.
When participants click the join button on your team page, they will be navigated to enter the join code.