You can use the following to link to me on a website:
"<a href="http://alpha.comicgenesis.com/"><img src="http://alpha.comicgenesis.com/images/link.jpg" alt="Alpha"></a>"
For forum signatures using BBCode, you can use the following:
[url=http://alpha.comicgenesis.com/][img]http://alpha.comicgenesis.com/images/link.jpg[/img][/url]
Both will look like this: