At any page on the site, select "Your Reservations" in the header. If you already have an account, that is great. Just go in and follow the simple steps to make a change. We can help if you have lost your password.
If you do not yet have an account, just enter your email address and create an account. The CarRentalExpress.com site and Revolution reservation system are smart enough to locate the reservations associated with your email address.