Add a Teacher in Seesaw

I was recently asked by a teacher to add her to my class. Although I am a SEESAW AMBASSADOR, I had never done this before.

I opened Seesaw and read the screen. The wrench in the upper-right side is where you can edit the settings.

When you click the wrench, it opens the Class Settings. The third option is to Manage Teachers. 

After you click Manage Students, you are presented with an option to invite a teacher.