Insert your Blogger headers into the new blogger layout wihtin a minute
Click --> layout and click edit button in the header
New window will open, paste the image code or upload an image from your
computer. If you need free banner/header code for your blogs visit webheader-banner.blogspot.com.
Copy and paste the code after the "http://" and click the save changes
If it is not working well please visit this website and insert image url.