Using StudioBookings is free for all your members. Your members just need to create an account. Your members can create an account or login or signup by clicking the 'Need an account, Click Here' link at the top left of your StudioBookings site.
It is important that a valid email address is used as this emails is where all your class related emails will be sent and will also serve as their login ID.
A studio owner can also sign up a member or create a member account by going to Members -> Add Member.