How to add friend in Stumble Upon

I am sure everyone like to know how to add friend in Stumble Upon. I am one of the user as well. I am sure you do know my nickname it is gopinksherry. I love this because my previous one as sherrygo has been hack by hacker.

If you are Stumble Upon user, I hope you will add me. By the way, do not miss out the chance to win 68,000EC in my first contest .