To edit a group, go to Space Settings > User List > Team, and click on the team's name in the list. This will redirect you to Nulab Apps.
You can change the title or user role permissions by clicking the gear to the right.
To remove a member, hover to their name and click “Remove”.
By clicking the settings icon to the right of the team name on the Team List, you can proceed to the team’s settings dialog. To delete a team, click on the “Delete this team” button.