After youve selected the page number format Headers & Footer Tools open in the Design tab.
From here you might change different options such as Different Odd & Even Pages.
The process is virtually identical in Word 2010 as well.

That is really all there is to it.



![sshot-2010-02-15-[20-32-43]](https://static1.howtogeekimages.com/wordpress/wp-content/uploads/2010/02/sshot20100215203243.png)
![sshot-2010-02-15-[20-45-42]](https://static1.howtogeekimages.com/wordpress/wp-content/uploads/2010/02/sshot20100215204542.png)