disable youtube on tivo bolt

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So this morning I came down and my 6 year old was surfing videos on youtube on my new tivo bolt. He had gotten into stuff he shouldn't have. I never even logged in but it's youtube and it's preinstalled.

How can I prevent him from getting in?

by the way, he woke up on his own at 5am and was in there, which is another discussion we had, but that led to this question. I worked on it this morning before work, but I can't figure out how to stop him from getting in there.