Access the Navigation Editor
The navigation editor gives you the ability to change the position of the navigation links located on your website. The editor does not just save on the page you are editing, but all the pages that contain that navigation. A partial publish is performed when you save your changes so you do not need to publish the individual pages for the changes to go live.

To access the navigation editor make sure you have the "Standard Toolbar" and hover over the menu. Select "Navigation Editor" to enter navigation editor. Positioning the pages
When in the "Navigation Editor" the only editable content on the page is the navigation. Click and hold down on a page in the navigation and move it to the desired position and let go of the click. When you are happy click "Save changes".