If you need to change the name of a class, you can do this from the Roll Call page of the class.  Please see below for the details 

Select the class on the calendar and select the 'Roll Call' button, then select the 'Edit' button by the name of the instructor.  

Once you see the page below you can update the class detail for just that single class. Here you can update the name of this one instance of the class, change the instructor of this single class, etc.

Remember to select 'Submit' to save your changes.