Hi Wanda,

As of now, there is unfortunately not a co-teacher feature, though this has been a popular suggestion and could possibly be implemented in the future. In the meantime, this article can provide you with a couple workarounds that may be helpful: https://support.khanacademy.org/hc/en-us/articles/203610350-Can-a-user-have-multiple-coaches-Is-there-a-way-to-add-a-co-teacher- 

I hope this helps! Please let me know if you have any further questions.