How can I change my details on a confirmed booking

Any accessories hired for the duration of your car rental (such as satellite navigation, roof bars, cycle carriers, child seats etc.) should be present in the vehicle when you come to collect it. In addition to showing you around the car, the rental clerk will walk you through all of your optional extras, including how they work and any safety features. For articles that attach to the car, these will already be pre-attached to the vehicle (and checked) meaning that you don't have to worry about fitting instructions.