To edit your vehicle profile visit the rides section. Underneath where it says My Vehicles you simply just click on the vehicle you wish to edit. Click Edit Vehicle near the bottom in the Manage Vehicle Actions section.
There are two tabs to Edit your vehicle, the first is the Vehicle Info tab. Here you can edit all the basic information about your vehicle.
The Images tab allows you to add more pictures. Browse on your computer for an image, then click Add New Image. You can also remove Images here also.