Each membership level includes Live Online Groups:
Starter Membership includes 2 groups per week and thus 2 credits per week
Premium Membership includes 6 groups per week and thus 6 credits per week
Unlimited Membership includes 20 groups per week and thus 20 credits per week
Each time you book a group, you use 1 credit. And each week your credit is refreshed (it doesn't roll over if you don't use it).
So for example, if you are a Premium member, each week you'll have 6 credits, and if you only book 4 group for the week, you'll have 2 credits remaining. If you don't use the 2 credits within the week, next week your credits will reset to 6 credits.
However, if you book 6 groups for the week, then you will have no credits remaining for the week. If you want to attend groups, you will have to buy credit(s). Each credit cost $20, and 1 credit = 1 group.
To buy a credit, first click 'Book a Group' button on your dashboard then click the 'Buy Credits' button.
You can select how many credits you'd like to purchase: