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 Classes, click on the class, then "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! Click Update and you will be all set!
To swap in a substitute for a single class, click here!