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First your pic has to already be on a website somewhere. Once it is, just type in the url in your post with the tag (word "img" in square brackets) just before the http and "/img" in square brackets just after the .jpg (no spaces) (I can't put the end tag in this example because then you wouldn't see it).
As fireball said, have the picture up on the web someplace Corvette Forum webspace is a good place, click the red tab at the top that says Home Pages, it is easy to upload your pictures there.
Then after your pictures are there, do this...
{img}http://temp.corvetteforum.net/c3/yourname/yourpicture.jpg{/img}
The only thing is replace the { } that are around img and /img with [ ]
I had to use the curly braces so the line of text would show up!