Ahh, come on now, cut him some slack. They said they were new users.
But with that said the receiver does need to be setup for an internet connection before the you-tube will work.
Again all that info is posted in the AzBox Users Guide.
Much of this would have not been necessary if there was a real manual from the manufacturer for this box from the get go.
However, with the users guide now posted for az owners that should be the first place to start for all, as most of the questions are answered there.