Okay, what do you need "to use" all about this app for? The Fire TV, thats it? Nonsense, would be far too simple. You first need a WiFi network, so forget the idea to join the Fire TV with an Ethernet cable! Wifi, check. Now it needs a mobile device such as tablet or smartphone, in the selfsame Wifi network. Because I wonder seriously, where the meaning is? If before I must try my Smartphone, why should I still make their way across the Fire TV? Opens up everything to me not really. That would be something like this when the Spotify app would work on the iPhone only with a Macbook on the same WiFi network. Laugh briefly. I can imagine that the app does have its Existenzberechtigun, for example if the amplifier does not support Bluetooth on TV. About the app a stream on the home theater system is possible, but just between us, but that Spotify is advertised as a key feature, this is a damn poor appearance I had not expected. Just because one of Spotify excellent implementation is accustomed.