Although Admin-Users is not a feature of the Permission Groups plugin, it is discussed to simplify the flow. Note: In order to create multiple users to access your app admin, you need subscribe to the Multiple Admin Users plugin.
1. Admin > Teams > Admin-Users. Click on the '+ New Admin-User' button, and provide the user details.
2. Complete other tabs as briefly explained below.
Photo: Upload a picture for the user profile
Edit: Allow user to edit all articles
Push and Promotions: Give permission to create promotions and send push notifications
Statistics: Allow access to the Statistics section
Advanced: Enable access to create and manage Permission Groups