Apple TV on my tv

the app appears and it opens but that is all!

Next, sign in to the Apple TV app with your Apple ID account. Find Setting through the sprockets wheel icon.

Sign in to the Apple TV app - Apple TV app user guide - Apple Support

Apple TV app user guide for smart TVs and third party streaming devices - Apple Support

If you have the Apple TV app on your smart TV, then you do not need the Apple TV remote and box for access to

• iTunes Store movies and TV shows (buy or rent);
• Apple TV+ channel featuring Apple Originals, by subscription;
• other premium Apple TV app Channels, each by subscription.

The box has more functionality though. Apple TV app vs. Apple TV box - Apple Community

When using the navigation pad on your remote, the highlighted selection should change in that same direction. Watch what moves. If something below moves, then move up first, to get to the main menu bar.