you need to have the photo on a site like photobucket, smug mug etc . you copy the url code there ( it usually has one for forums or by size something similar)then in the edit signature section in user cp click on the yellow mountain icon and paste the photo url in the box that comes up. for some sites( ie imagekind) you need to right click on the photo, go to properties and get the url that way if there isn't a url code for forums the do the yellow icon thing