At the top of this page, click on the heading "TICKERS". Once you created your ticker, copy and paste the link into your signature line (go to user "CP", then "Edit Signature").
I often wondered this same thing. I followed your directions but I don't know which to copy and paste. I tried all of the ones there and when I paste to my signature, I don't get the picture only the words. What am Idoing wrong?