The teacher who first creates the class is the owner.
The class owner can add other teachers to the class as teachers by entering their email address or username.
Once a teacher is added to a class, they can access the class page from their classes page, as if the class was theirs. They can do everything except invite other teachers (only the owner can do that).
@jonwetzel commented on Thu Aug 30 2018
The teacher who first creates the class is the owner.
The class owner can add other teachers to the class as teachers by entering their email address or username.
Once a teacher is added to a class, they can access the class page from their classes page, as if the class was theirs. They can do everything except invite other teachers (only the owner can do that).