I am an administrator:

Navigate to Admin -> Classes. Select the extra ... menu for the desired class.

Begin typing in the Co-teachers field and select the desired teachers to add. You cannot edit or change Official Teachers. Save.

I am a teacher:

From the Card view of Classes in Gradebook, select the more menu for the desired class.

Begin typing in the Co-teachers field and select the desired teachers to add. You cannot edit or change Official Teachers. Save.

Co-teachers will have access to all of the Plan content and Grade entry features for this course without any further steps.

Note: In some cases, co-teachers can also be assigned by your schools' SIS. These are managed Official Teacher co-teacher assignments and cannot be edited in JumpRope.