If you’re logged in and the guest info page won’t accept an address or ZIP code, update it in My Account under ‘My Profile’, then return to booking.
During the booking process, guest details are pulled directly from your saved profile, which means address fields may be locked at that step.
To make changes - visit 'My Account', open the 'My Profile' tab, select 'Edit' in the ‘Profile Information' section, save your updated address and ZIP code, and then continue booking with your information already in place.