To define and manage the location(s) where a membership/credit can be sold and booked, you'll need to navigate to the respective membership or credit type.
Setting the locations directly on the membership/credit type will allow the associated membership contracts/credit packages to inherit the location selection(s).
Navigate to Products then:
To edit the location permissions for a credit type: Select Credits > Credit Types > New Credit Type (if creating a new credit type) or Edit (if editing an existing credit type).
To edit the location permissions for a membership type: Select Memberships > Membership Types > New Membership Type (if creating a new membership type) or Edit (if editing an existing membership type).
Under Locations Available, select the location(s) where you want the credit/membership sold and used.
Click Save.