This site is a little different... You should go to the "Rides" section and click on "NewVehicle" and set up all of your info for the vehicle. Once you have all that entered, click on the images tab.
Then you need to use the browse button to find the picture you want, which should be on your computer (or the camera if the camera is connected to your computer)
Once you hit ok, you will need to hit the "Add Image" button on the New Vehicle Images page. You should then have pictures that you can link to saved in the garage.