Well, you have to make what you think is good enought for a Signature in paint, or photoshop, or anything that makes and saves pictures. Then you must put in on a website or upload it from your PC, but i have found out that when you upload it, it usually comes from your own computer (don't laugh just yet.) and many people can't see it from there computer because the file that you copied into the little box thingy is from
your computer, and on other peoples computers they don't have that file. I got my pic by putting it on a website and copying the url into your 'edit signature' thiny after putting < img src="website adress here" >. remember
(no space between the "<" and the "img")
to put the quotation marks (") before and after the website adress. If this doen't help, and is confusing, then my work here is done. If you actually understand it, then good for you
.