Only a Group Admin can remove Moderator permissions.
If you are a Group Admin and would like to remove a Moderator (including yourself), follow these steps:
Open the Insight Timer app.
Tap the menu icon (☰) in the top-left corner.
Tap Groups.
Open the Group.
Tap Settings in the top-right corner.
Scroll to the Group members list and select the member’s profile.
Tap Remove Moderator.
Once removed, the member will no longer have Moderator permissions.