Is it possible to block You Tube in the Apple TV ?

Hi Rudegar! Thank you...I have done that but then my son brings it back. I want to block it in some way so only I can bring it back. I don't like what he watches on You Tube and he sneaks it back while I am working...:(

I didn't even know that existed. I will look and thank you so very much for your help! I'll let you know the outcome! Fingers crossed!! Thank you so much!