You can change the instructor of a single class or you can change the instructor permanently. Here's how do both:
Swap in a Sub for a Single Class
You can swap out the instructor name of a particular class time anytime. Just click on the "Classes" button at the top of the Punchpass home screen & click on the class time you need a sub for. From there, you can "Edit Class" & change the instructor name for that class time only:
Here's a Tip: If your sub isn't someone who's a regular instructor, you can add an instructor named "SUB" to your list. Just visit Manage Account => Manage Instructors and Users to do that.
Permanent Change In Instructors
For a permanent instructor change (you are changing an instructor for a class moving forward), all you need to do is edit the current class time (with the prior instructor) and change it to the new instructor. Go to Manage Accounts => Manage Classes to "Manage the Repeating Schedule" for that class.
At that point, you can click "Edit" on the class time...
...and change the instructor for that class time moving forward. You can also choose an 'Effective Date' when that change should take place - helpful if you know ahead of time!