Changing the order of the site menu
How do I change the order of my site's menu?
Your site's menu is what you use to move around your site from page to page. Each option on your site's menu represents a page you have created. The pages you create are listed on your site's menu in the order you create them in, unless you move the pages around.
To change the order of your site's pages, which will change the order they appear in on your site's menu, see How do I move a page?