Link to Home in Header

I have successfully gotten the header of the theme I chose to be a graphic someone made for me…but like a dunce, I just discovered that by doing that I no longer have a link in my header to my starting page, home page, or whatever the first page is on my blog. How do I go about making that whole graphic become a link to my ‘home’ page? I have been to the ‘header.php’ of my theme and I am actually quite lost as to what I am supposed to change? ANY help would be greatly appreciated!

Thanks ~ KnicKnac