To change the order of the pages in your site menu, click the Reorder pages link on the Site pages screen.
Now, drag and drop pages to the desired location within the menu. To make a page the home page, drag it to the top of the menu. Once you are finished reordering pages, click the Save page order button.
You can also control a page's position within your site menu – and designate it as your home page – through its page settings. Using the options under Position in menu, you can place the page after another page or remove it from the menu altogether.