Take a good look at your email. It should tell you. Often, the ticket packages have you pick up your tickets at a will call kiosk (at the hotels and parks) and your code will be included in your email.
This is what it says on the booking website ... Redemption Information: We've made it easy to pick up your theme park tickets at our Will Call Kiosks conveniently located at the front of both Universal Studios Florida™ and Universal's Islands of Adventure™. Swipe a credit card matching the lead guest's name listed on the reservation for identity verification only, enter your Reservation Number provided on your E-Travel Document and tickets will print automatically.