Edit (credit balance)
Not all clubs choose to enable credit balances, but for those that do, members can each have an available credit balance that they can use to purchase classes/bookings. (Some clubs choose to include classes for free as part of membership and have no need of booking credits)
When enabled, it starts at zero for a new member, who must purchase additional credits in-gym (credits can be automatically added thereafter if auto top-up amounts exist in the club's setup - see additional settings in the setup tab).
Caution
As with many other areas of the product, the logged-in staff member may not have permission to perform some actions, and so the button to edit member credit may not be visible.