I don't understand the intent of the question?? If you booked a package with hotels the information on those hotels and your dates and bookings is in the package information confirmation and receipt. If you want additional rooms in the hotels that are part of the package you can contact the hotels directly via their WEB sites. I hope this gives you a clue but maybe you could elaborate on your requirements for hotel bookings.
Call your Gold elite reservations number on the back of your Marriott Gold elite card and they will do it for you or walk you through it. This was the simplest way.
I was able to reserve a room on line using Marriott rewards points (in step two of five of the process) it asked me if I wanted to attach my unused certificate to my reservation request. So you might want to give it a try on line.