Header Image problems

Hello all. I’ve read all the forums about replacing the standard blue blob with an image. I’ve created the image I want. I’ve renamed the original blue blob. Then I named my new image/header “kubrickheader.jpg” and uploaded it. I still do not see it on my blog.

There must be something in the code that I have to change, right? I have no idea what that is. Can someone help?

Thanks!
Jeff