Header Image
If you want to use the image shown in the image above, download this header image. You must register and login first to download the large image. Save the image in your computer. Then, upload the image onto your blog header in the Layout: Page Elements section. As per license requirement, give credit to the header image provider by linking to Free Web Page Headers.
If you want to use your own image for the header, the image has to be 800 pixels wide (with any height) to fit the header nicely. Move the Blog Title & Description around the header if it's not visible after you've uploaded your own header image.