Before sending invitations to friends instructor can sets rewards for the course.
Click Courses in Global navigations.
Choose Sublime referral
Click the Email text field [1] and type a valid mail id. Click the Send Invite button [2].
Type the Invitation points in the first text field [1] and Enrollment points in the second text field [2] respectively. Then type the Invite URL in the field [3] and click the Update button [4].