Click on email tab and populate text that will be sent to user after he gets coupon.
Thats it! Now every user will have referral link in their account page. After someone makes a purchase through their referral link, and after order is marked as complete. They will recieve coupon in their inbox. For every order that was done through referral, in a single order screen, just below customer you will see the name of the person who referred him.
