How do I give staff access to schedule classes?

Set individual staff permissions in Admin Settings > Staff Permissions.
To give full schedule access, including editing and creating new classes, enable both Schedule - View Only and Schedule - View & Edit permissions.Staff permissions are set for each individual staff member under Admin Settings > Staff Permissions.

To issue a staff full access to the schedule to edit and create a new class you need to tick both the Schedule - View Only & Schedule - View & Edit.