Airplay
How to get Airplay on iphone6
iPhone 6, iOS 8.4, Iphone6
you swipe upward from the button, it give you a menu and all airplay able devices will show up there
looks like this http://static1.squarespace.com/static/502c3c29c4aa67a228f9b4c4/t/534ff068e4b073d fbc7b402a/1397747818644/
airplay only work on wifi not over the Internet so make sure whatever airplay enabled device is on the same network as the phone
if you want to know more
Use AirPlay to wirelessly stream content from your iPhone, iPad, or iPod touch - Apple Support