By default, the teacher that created a community is the only teacher that can moderate posts and comments, approve new members to the community, and edit community preferences. If subsequent teachers join your community they will be able to make posts and comments without moderation but will not be able moderate student activity in the community until you grant them “Teacher Privileges.”
The other teacher(s) join using the community Access Code and must be approved by you in your Activity Feed.
You can allow teachers who join your community to moderate content and approve new members by granting them “teacher privileges” in this area of the panel. All teacher members with teacher privileges in a community can see all community activity and interact much as the students do.
To grant full teacher privileges to another teacher, slide the "Teacher Privileges" toggle to "ON." Revoke Teacher Privileges by sliding the toggle to "OFF."

Remember: Be sure to click “Save Changes” so your changes to take effect!
Co-teachers essentially “share” the same activity feed activity for the community in which they both have teacher privileges. If you have a co-teacher with teacher privileges in your community, the action EITHER teacher takes in the Activity Feed for that community will mirror across all other co-teachers for that community. For example, if Teacher 1 approves a Community post, it will show as approved in Teacher 2’s Activity Feed. If Teacher 1 marks an item as “read,” it will show as read for Teacher 2 (even if teacher 2 never looked at it). If Teacher 1 disapproves a student post (and the post is returned to the student’s Drafts), the post will disappear from BOTH teacher’s Activity Feeds until it is resubmitted by the student.

Tip: Provide community access to your Learning Support Teacher, ESL/ELL teacher, Gifted teacher, or other specialists who work with students in that class. You can decide together who should moderate these students’ posts, but teaming up with other specialists will support students’ individual needs.