Apple has changed the way you use Airplay in iOS 7 & iOS 8. If you are using iOS 7 or iOS 8 you will use the “Control Center” to connect to speakers via Airplay after both devices are connected to your router. To get to the “Control Center” you will swipe up from the bottom of your screen then select the Airplay icon. You ten select your device from the list and you are connected.
How to Stream Airplay with iOS 7 and iOS 8