You will need to call to do it. I don't think currently there is anyway to make actual changes online.
Another option is to contact Dreams Unlimited and have them take over your reservation. They will do their best to obtain the best rates and codes for you as soon as they are released. I am very pleased with what Sue Ellen at DU has done for us!
I also believe that you can't change your online ressies online yet, but you can definitely change them. We've made changes to our online reservations by phoning before.
When you call, specify that you made the reservation online as well. This seems to eliminate a lot of confusion for the CRO person. Last time we were told that the computer systems were slightly different, so they have to look somewhere else for online ressies.
You might also have to cancel your existing reservation and make a new one with the new rate, but CRO will handle this for you over the phone (we've done this too - just last week in fact). You should have no problems.
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