If you want to assign courses to a power user for them to manage, you can do so by clicking on the icon under the Courses column on the Manage Power Users page. You will be redirected to the courses listing page of the power user. On the courses listing page, press the plus button at the top. You can select courses from the list. Press ASSIGN button to assign courses to the power user.
You can unassign courses from a power user. This can be done by selecting the courses which you want to unassign on the courses listing page of the power user. Press UNASSIGN button to unassign courses from the power user.