1. Configuration > Click on Allotment
2. Click on edit icon from the role row (As you can see the all registered will appear)
3. select Admin from login type
4. Select Status to active for a shop which you want to activate (you can change the status of shop)
5. After allotted a shop click on update.

you may refer to this short video to select a shop

Note: For security reasons, You can only select or view shops thar are alloted to you by the administrator/master/owner.