After choosing "Manage Friends," you will then be taken to all of your current friends in the app. To share with your friends simply tap "share" and to stop sharing with friends tap "sharing." To remove friends tap the "X" button shown below.
You also are given the option to refer friends at the top!
How do I find my friends?
Select "Find Friends" on the top right hand side. This will allow you to connect with your Facebook friends and contacts in your phone! Tap "connect" to follow your friends on Facebook and connect with contacts from your phone.