you are on the xfinity streaming website area of the forum. you probably mean how to access youtube - use a browser and type in url youtube.com it has nothing to do with xfinity nor apple tv.
I am not a Comcast Employee. I am a Customer Expert volunteering my time to help other customers here in the Forums. We ask that you post publicly so people with similar questions may benefit from the conversation. Was your question answered? Mark the post as Best Answer!