If your classes are already defined and your schedule is basically in place, you might you need to adjust specific days without changing your regular schedule. You can do that by visiting the "Classes" page from your home screen.
You'll see a nice calendar view of your classes here which matches the layout & color you set up for your public calendar.
There are buttons to quickly jump between months, and you can filter the calendar by class or by location. (This is also a feature included on the Public schedules.)
Dropdown menus appear for each class and day to give you quick shortcuts to common actions:
Delete a single class or an entire day's classes
Add a single day class
Add a recurring class to your schedule
Remember that for more major, ongoing changes to your schedule, you can always toggle from the Classes page over to the main classes setup by clicking "Manage" then "Classes"