Hello Karon and welcome to our community. I'm going to have a member of our @Traveler Experience Team11 respond here or contact you directly to assist you with this question about rail travel and help you book your tickets, if you decide to do so, through ItaliaRail.11
I'm not sure what pass you're referring to, in terms of how to activate your pass. But if you explain this to our traveler experience agent when they get in touch with you, I'm sure they can help!
Thanks for your question and have a great time in Italy!