1. Login.
2. Click "Change This Page's Look" --> "Change the Colors or Images."
   
   
   
3. A window should open.
   
   Select a color: Choses the pages color scheme.
   Select an image: Chooses the header image.
   
   
   
   There are a wide variety of headers to choose from.
   
   If you have had custom headers made they will say "Custom Header #."  These do not have previews available so you may have to go about finding out which header is which through trial and error.

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Problem #1: "I changed my header, but some pages have the old header still.  What do I do?"
Answer: You have only changed this page's header. To change all the sites pages you need change the site's default header.  To learn how to do that go here.