Sometimes you will want to give some of your apps users special privilege, unlock premium content.
It might be useful in order to prevent user churn, to motivate the most active users for their contribution, or just to emulate premium user behavior in a release build of the app.
Go to Users in left side-menu, find and open a user's profile. In the top right corner you will see Promotionals section.
Select desired permission group and subscription duration.
Available periods are:
Just click on the cross icon on the granted promotional to revoke it.