Amend personal details
You'll need to visit your Trips and bookings page. There you'll see your bookings listed in 6 blue capital letters with a date attached.
Tap on the booking you want to change and choose 'Amend personal details' from the list.
Follow the prompts and add your new details.
Make sure you save your changes.
You'll be sent an updated confirmation.
Your name and car registration can be changed right up to your booked arrival time.