Global registration settings for customers can be managed from Settings >> Registration >> Customer settings >> click 'Edit'.
From here you will be able to manage the following settings
Registrations per day - Set maximum registrations per day, independent of membership limits.
Waitlists per day - Set the maximum waitlists your customers can be added to per day.
Include waitlists in registration limit? - Decide if you want waitlist registrations to count toward the registrations per day number.
Prevent joining waitlists after registration limit is reached? - Enable if you would like to prevent your customers from joining waitlists after they've reached the registrations per day limit.
Number of failed payment attempts before a membership is unusable
Number of days before a pending membership payment is considered overdue - Once you've set the number of days here, you may wonder how you can block a membership from being used if it has overdue payments. For more information on this topic, please see How can I block a membership from being used when it has pending payments.