Happity is designed to support classes that take place weekly (e.g. Mondays at 10am). Adding specific dates to this is optional, and only required if you wish to take bookings through Happity, as this will create a new register for each session.
This is located on the 'When' tab of the Schedule Wizard. After you have selected a weekday for your classes (e.g. Mondays) you'll see a list of dates appear for the next few weeks. Simply tick all of the dates your class is running.
Before proceeding, make sure to set a default of spaces that you want to make available for each of these classes. This will create new blank registers for each date.
You'll be able to edit the number of spaces for each individual session from the 'Registers' tab later.