Once Spatia is connected to your network, bring up the Control Panel by swiping your finger upward from the bottom of your screen. Wait a few seconds before the "Moshi Spatia" AirPlay option appears next to the AirDrop menu item.
Then simply tap the Moshi Spatia AirPlay option to switch your iOS device's audio output to Spatia. You can now stream your music wirelessly from any iOS app.
Note: Due to Airplay audio buffering, there will be a slight delay (1-2 seconds) before initial playback.