Apple TV unable to downolad apps with Apple Id
I just got my dad an Apple TV and I cant download any apps because it keeps telling me that I have not signed into iTunes with his Apple ID yet. When I enter his Apple ID & password, it takes me back to the original screen that says I havent signed into my iTunes account with the Apple ID. I cant seem to get past this screen. I went can't just go to Itunes and login, it just take you to Apple Id login which I have but still going in circles. There are only options to purchase things. I do not want to purchase anything. I am really stuck here. I just want to download apps into his Apple Tv so he can start watching whatever he wants.
Thanks