OK that was strange. I clicked reply and it let me edit your post. Joey, I think we need to look at that..
Anyway,
So your trying to upload pic of the car to the members garage? Usually the problenm is that the pics are to big. They can only be like 72k or something. If they're any bigger than that the upload will fail.
If you want to put a couple pics in a post you would go down to the "click to upload photo" button then click on the individual "Browse" buttons to choose your pics, then click on the "upload" button. Once that is done you should see the list of pics near that "click to upload photo". Click the submit post and you're done.