I think that the prompt in question is about whether the purchaser also wants to buy a MetroCard for the subway, and the correct answer is, in fact, none.

My recollection of the TVM process for the machines at Jamaica Station are that they make it ridiculously easy. The screen says something like "to Penn Station" and you press that button, press the number 1 for the number of tickets you want, choose your payment method and pay. Hopefully your nephew can handle that.