It has to be hosted on an approved imaging site, i.e., imgur, photobucket, etc. That site will give you different links for this image. Copy & paste the direct link, exactly
into the signature picture space provided in your user profile. Make sure everything is deleted from that space before pasting the image link. Click the submit button.
Actually, I've already hosted the pic. If you want, you can just copy & paste the direct link
for this image into the sig pic box in your user profile. Just be sure that box is empty before pasting the link in it. LINK
Copy the direct link from this page