tunatango on "Customising twenty ten navigation menu"

Just go to the top-left side of the page in wp dashboard and click on
Pages. You will get a list of the current pages. Hover over the page titles and a menu will appear, click on edit. When the page comes up simply go to the top of the page where the current page title is displayed and change it to your new titles and then click the update button on the right side of the page.