Hi there,

From the class you want to assign the course to, select "Add a course" if you have not yet done so already. Then check AP/College Statistics and save. 

You can then check all of the units you wish to assign, click Assign, and adjust the question set preferences and due date.

Another option would be to set a course mastery goal. Information on assigning a course mastery goal can be found here: https://support.khanacademy.org/hc/en-us/articles/360030694212-How-do-I-set-and-view-Course-Mastery-Placements-Goals-

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

Thank you very much this was exactly what I needed.