Did you get Amtrak's new E-ticket with a barcode on it? From what I understand all you need to do is flash the barcode at the station kiosk and you'll have your tickets in hand.
I think you are confusing two very different things.
If you have one of the (older) Quik-Trak reservations, you need to go to the kiosk, and get your ticket. At the Quik-Trak kiosk, you can either have it scan the bar code on your printed reservation, or insert the credit card you used to pay for the reservation. The kiosk will then print out your ticket.
If you have one of the (very new, started July 30, 2012) E-tickets, you can simply go to train. The E-ticket PDF is your ticket. You can either print out the emailed PDF, or they will even accept scanning at the PDF right off your Smartphone screen.