To view the headers and footers area in your document, click the View menu and click Headers and Footers. This will do a few things:

 

1. Place your cursor in the header.
2. Show headers and footers with a dotted box around them.
3. Open the Header and Footer toolbar.
4. Gray out the body of your document.
5. Change your layout to Print Layout.

 

All these changes are temporary while you edit headers and footers. Once you close the headers and footers view (which you can do by clicking Close on the Headers and Footers toolbar) your document will return to its previous layout. Also remember that formatting markers (like the dotted box around the header or footer) are only markers, and will not be printed with your document.