If you'd like to add a co- teacher to a classroom, you can easily do this. Please Note: If you are rostering Yeti Academy with Classlink, you will make all enrollment changes there and not in Yeti Academy.
First, go to your Staff tab from your Dashboard.
Then, select the checkbox next to the staff member you'd like enroll into a classroom. From the right fly-out menu, select Edit User & Enrollments.
Now, scroll down to Class Enrollments. Search for the classroom you'd like to add the teacher to. When you've found it, select the + Button next to the name of the classroom. Simply click outside of the window for your change to take effect.