In order to add an admin to your StoreYa back office, please:
1. Log into your StoreYa.com back office using the first Facebook personal profile you used to sign up to StoreYa.
2. Browse to your Account > Permissions tab
3. Ask the desired admin to log in to StoreYa using their Facebook profile (i.e. click the connect with Facebook button).
4. Add below the URL of the desired admin's Facebook profile (after they have logged in to StoreYa).
5. Click on "Add Admin" button.