Add Student Enrollment creates a test student user, which is enrolled into the course that is being authored. This allows users to visually see how the edits to their course content and structure would appear for the student users that will view the course.
NOTE: User needs be an "Owner" of the course, or have the "Control Course" permission granted, to perform this action.
Click on the User Information drop down menu button(). Select Add Student Enrollment.
Click on the Yes button to confirm enrollment of the Test Student.