If you are co-teaching a class with other instructors/ teachers/ professors or assistants, you will likely want your colleagues to have access to the class settings by adding them as an instructor to your class.
At the bottom of the settings panel (link at the top right of your feed http://ponder.co/feed) you will see the invite button.
When you click it, you will have two choices. "Readers" gives you a link for students to register for your class. "Co-Admins" will allow you to invite users who you want to have full administrative privileges for your class.
You can have as many instructors in a class as you'd like, and both students and teachers can be in multiple classes simultaneously as well.