The easiest way to do this would probably be to change the element header section to a link. Change it from a div to a a element and add the href="#" value with a link to the page you want the header to link to.
Next, go to the element in style.css (line 231) and add the code display: block; to it. That should do it. Note that you might have to remove the link from the site-title element for it to work properly.