You mean you want an image that is clickable and takes you to another site? If so this is how it's done.
HTML Code:
<a href="http://www.eshopforums.com"><img src="http://www.yourimagehost.com/images/image.jpg" border="0"></a>
You can also add an alt tag to the above line with extra information to help those who are visually impaired using special software and aid search engines to know what the image and link is about.