Hi Melody!

You can remove the Khan for Educators course from your class by following these steps:

1. Go do the Settings tab in your class
2. Click on Change course
3. In the popup, uncheck the box next to Khan for educators
4. Click Save

If you're referring to a Mastery Goal, you can delete it by following the steps here: https://support.khanacademy.org/hc/en-us/articles/360030782352-How-do-I-edit-or-delete-my-students-Course-or-Unit-Mastery-goals

Please let me know if you need any further assistance!