Basic Details
From settings, tap "Basic Details" to modify:
Group name
Group description
Start and end dates (Challenge groups only)
Scoring mode
Advanced Details
From settings, tap "Advanced Details" to manage:
Teams functionality
Member entry permissions
Note: Only group admins have access to these settings.
Add a moderator or another admin
Open the member's profile from the group.
Tap the menu (⋮) at the top right.
Choose Make moderator [confirm: or Make admin].
Moderators can remove check-ins, add members to teams and remove members. Only admins can change group settings. See How to delete a check-in, How to create teams and How to remove or block someone from your group.