Open the App (coin master) > close out of the pop-ups > in the upper right hand corner you should see an icon that looks like a crosswalk, tap on that > under your name the fist icon in the fist row is the share icon, tap on this > a pop-up will show you will have two choices one is a green button and the other is for Facebook. Chose the green button and it will launch in like a text message format with a URL, the URL you see is your unique URL to add friends