The Easiest Way:
Take the photo and copy it onto your desktop, then go to
www.imageshack.us and press browse. A directory of your computer will come up and find your desktop folder, and double click on the photo and when the window closes press upload. Once it is done, find the box named 'Direct Link to Image', copy the contents of the box and copy that, go to the DIS and your signature editing box, type in
and it should look something like (I used brackets so it dosen't turn into a picture)
(img)
http://img441.us/image411/5600/something1qg.jpg(/img).