Teams can be set up for your game via the Teams tab in the online game manager. Towards the bottom of this page, there will be an option to Pre-Create Teams. Hit the green + symbol button, and you'll be able to add some teams to your game. When you do this, participants who are joining the game via the app will be prompted to join one of the teams you have created. When setting up teams, you are required to give a team name, and you also have the option to add an access code or photo for the team. Adding a team access code gives extra security as participants will need to enter it before they can join that team. Adding a team photo is also optional, but it's a fun way to make the teams, Activity Feed, and Leaderboard more exciting!
You also have the option to let participants create their own teams, which is can be controlled by ticking or unticking the box at the bottom of the Pre-Create Teams section. When participants create their own teams, they'll be able to choose their own username, team photo, and team access code.