You use the same format that you use when adding an image to a new post, except you put it in your signature section of your profile. Just put (img)http://www.image.com/myimage.jpg(/img), except replace the () with  on the img tags.
'86 Bronco, 300hp 460, E4OD
'85 Ranger, 350hp 289, T5, [email protected] (1.96 60') on street tires
<font size=-1>[ This Message was edited by: Motorhead on 9/6/06 11:50pm ]</font>
<font size=-1>[ This Message was edited by: Motorhead on 9/6/06 11:51pm ]</font>
PS: I love that Torino. I had a factory green 71 Torino 500 coupe for 12 years before the frame was no good from being tourqued. I had a 351 W with over 450 pounds tourque. Daily drivin to work, every morning pulling onto the highway was a 1/4 mile run to to 110 MPH. A great way to get the day going, but after 3000 such wakeup calls at 6:00 am in the morning, the frame was finally done. I miss my Torino.....
Greg is right, if you look at your link, it looks like you have everything right except you're missing the [/img] at the end, just add that to the end and it should work. If you add it and it's still getting chopped off/not working, then your signature might be too long, try removing a word or two from it.
Greg, I will also say about the Torino... It was the best car in the corners I have ever drivin. Not sure how it is with a big block in it, but the Windsor I had, was 45 / 55 weight differential, and I would take S turns at off ramps at 85 MPH PLUS....that even todays technology cars could not do... most of the folks I worked with, could not follow my torino through the corners and eneded up in the Median
The Torino was designed as an oval track racer afterall.... could not convince the guys at work about that though....