Only System Administrators, Course Administrators, and Course Leaders can assign a user to a course or module level role. 

1. From the Dashboard view, select a course from Your Courses.

2. On the Manage Course page, click the Edit button.

3. At the bottom of the Edit Course form, use the Add buttons to add a user to the appropriate user roles.

4. In this example, the Add Course Leader button was chosen. Select a user from the list, then click the Assign button.

5. The Edit Course form shows the user Demo Teacher assigned to the Course Leader course role. Click Submit to save the changes.