You have two options to access the editing screen for a class:
You can access the class from the "Schedule" tab and click on the class you wish to edit.
OR you can access the editor from the class roster by selecting Edit Class after clicking the three vertical dots in the top right corner.
When the editor pops up, make the necessary changes to the class. If this is a recurring class, any changes you make can be made to this singular class or all future classes of the recurring series.
Once all changes have been made, click Update Class.
If you edit a single class in a recurring series, it will become a stand-alone class.
If you are just making a time change, you have the option of dragging and dropping the time of a class in the Schedule tab. Click the class you wish to edit and drag the class to the new time.
You can edit a class up to 48 hours after it has ended, except for location, date, and start time.