In Course Navigation, click the People link.
In the search field [1], search for the name of the user. You can also filter users by role in the Roles drop-down menu [2].
Click the user's Options icon [1], then select the Edit Role link [2].
Click the Role drop-down menu [1], then select the new role for the user [2].
Note: Depending on your user permissions, you may not be able to select from all user roles in your course.
If a user has multiple roles in the course, selecting a new role overwrites all the user's current enrollments.
Click the Update button.