This is not an official Orange app.
Seems not to be compatible with Orange in Poland.

Pilot your Livebox TV from phone. This Livebox remote control is simple, complete and ergonomic.
The app finds your Livebox TV on your Wi-Fi network. This can be done automatically at app start or manually from the settings screen.

If for any reason, the scan does not work, you can enter your Livebox TV ip address.
Your phone must be connected to your Livebox's Wi-Fi network.
You can now control your Livebox TV from anywhere in your home.

Tips: if automatic search does not work, go to the settings screen, click on "SCAN" then select your Livebox TV device. If it does not appear in the list, try to reboot your Livebox and try again.
If it still does not work, you can enter the ip address manually in the settings of the app. You will find it in your administrator interface, "my network" page, "connected devices" TV box icon.