Assigning a group class to a different person/calendar

Hello,

I assigned a group class to a coach who is no longer teaching that class.  Now I need to change it to a different coach, so that she can see the class members in her third-party calendar. How can I do so? 

Thanks!

you need to move the class to the new coach, you can do this by going into appointment types > selecting the class and assigning a different coach