Using the AirPlay functionality on your Apple device, you can listen to IDAGIO through your Apple TV, AirPort Express or AirPlay-enabled speaker.
Connect your iOS device and the AirPlay-enabled device you want to stream through to the same WiFi network.
Open the IDAGIO app and start playing something.
Tap on the player view (the dark bar at the bottom, above “Discover”, “Browse”, “Moods” & “Collection”) to open the expanded player view.
Tap “Devices Available” at the bottom of the expanded player view.
Select the device you want to play through.
Connect your computer and the device you want to stream through to the same WiFi network.
In the menu-bar at the top, click on the speaker icon and select your Airplay-enabled device from the list.
Open IDAGIO and play!
For further guidance, take a look at Apple's guide to using AirPlay.
Alternatively, connect your devices using: