You can join a team by pressing on the “teams” button in the main lobby.

Once you click on the 'Teams', you will be prompted to this page. You can now join or create a team.

Once you click 'Join', you will see a long list of open teams you can join.

You can also click 'Find a Team' if you would like to join a specific team that you aren't seeing in the list.

Once you find the team you want to join, click 'Join' and there you go!