You can manage the required fields in the member sign up form. When a member goes online to your StudioBookings page and signs up at your studio as a member, you may require that some fields on the sign-up page are entered and not skipped.  We consider this making a field 'Required'.  Example, you may require that all members enter their Birthday or maybe their address or both. 

In Settings, you can select the fields that you want to be required. 

Simply go to Settings -> Business Settings, and select the fields that you want to be required to be filled out.