nah dude, you gotta find a place to upload it online
http://www.daplayazclub.com/uploader/upload.php
use this to upload the pic, then take the url the image is uploaded to, for example, my sig link is
http://www.daplayazclub.com/uploads/DJHUissupercool.jpg
click the img button under the "subject" field paste the link and click img again
it should look like this (w/o the spaces)
[img]http://www.daplayazclub.com/uploads/DJHUissupercool.jpg[/img]
if you did it correctly it will look like this:
[img]http://www.daplayazclub.com/uploads/DJHUissupercool.jpg[/img]