The Indiana Lawyer recently posted an article I wrote regarding using headers and footers in Microsoft Word. I hope this helps you sort out this powerful but often confusing feature.
Know your head(er) from your foot(er)
The header of a Microsoft Word document is the space at the top of your document. You can guess where the footer is. They operate with the same rules, so the terms are used interchangeably herein. Headers/footers can be filled with text, images, fields — almost anything. Anything in a header/footer appears on each page of the document by default. This is helpful, especially when combined with Word’s date and page number capabilities.
Read the article here.