From here you can select, rearrange, create and delete pages within your site.
Click and drag pages to change their order in the navigation
Creating and Using Sub-Navigation
Drag a page to the right until a vertical white rectangle appears on the left to make it a sub-page of the page above it.
Click the arrow next to a page with sub-pages to hide or show its sub-pages.
Creating New Pages
Click the New Page button to begin creating a new page.