Add referral feature to wordpress website

I have an article website where people sign up as a contribiture and post articles. When a user submits a post, i would like it to go to another page which says: refer 3 friends and get your article set as featured (showing at the top of every page 'will show for a minimum of 1 day'). they then can enter in there (3) friends email addresses which will email them a notification to visit/sign up to hogsarticles.com. It will also email me, so i know to set their article as featured. Currently I am using WP User Frontend. It normally redirects them to the article they have just posted.