indeed, i has one and its skexy. use image uploading sites such as imageshack or photobucket to host and get the html for the signature spot.
Or you can just right-click on an image and choose copy image url. That what I did on my browser to get a picture from one of the greatest bands alive.
I used photoshop.com but you can get any pict. from any website as long as you have the location of the image. All you do is go to your use cp click edit signature. Once there you will see come icons above a text box. One of the icons will say insert image, click the icon and a little text box will come up, copy the image location and paste it in that little box that comes up.
Fixed Alternatively you can do what I did - upload it into your picture album here on the site and use that BBCode.
But won't let you upload decent sized images like animated gifs. :/ Which reminds me i need to reupload my sig somewhere...
for a more detailed instruction upload your image somewhere like www.imageshack.us then find and copy the "direct link" then go to your "edit signature" section in profile... in the sig box, use image tags ex: