Dear notayacht,
To delete your vehicle(s) please go to my account page and click modify link above vehicle's photo, and once on modify vehicle page - there is a delete button on the bottom of that page.
There is also Active check box on that page, if you uncheck it and save - your vehicles would not show up on my account page, but can be accessed from dashboard if you want to keep them just in case.
To add a new vehicle please go to my account page and click on Add New button in the header of vehicles table.
Thanks for your questions and have a great weekend!
