To add a new team, go to Space Settings > User Setting > Team, and then press the "Manage Team" button from below where it says List of Groups.
Then, proceed to the Team List Screen on Nulab apps. To make a new team, click "Create Team":
You can see a list of a team's members by clicking the team name.
For more detailed information on teams, please refer to "View and create teams" in Nulab Account Help.