If your Apple TV is black, 10×10 cm, then it is a 2nd generation or later.
Identify your Apple TV model - Apple Support
The white/aluminum, 20×20 cm, Apple TV (1st generation) is obsolete, both for support and practical use. It will not connect anymore to the iTunes Store (online streaming), it will not sync with current versions of iTunes (v12.7 or later) anymore (local storage). It doesn’t support any 3rd party content providers.
The App Store for Apple TV is only available on the newer models: 4th generation and later.
However, if the Freeview app for iOS supports AirPlay, then you may be able to cast it to Apple TV (2nd generation or later), and view your content on the big screen that way.