When logged in as a user in the Admins or Content Administrators role, you will see the Menu item Admin > Add/Edit Pages. Click this menu item and you will see the Page Tree of the site with features to add new pages or edit existing ones.
A screenshot is shown below, but why not try it yourself using the
online demos.
Click a Page Name to highlight it then use the up or down arrows to move the location of the page in the site. To edit permissions and properties, click the gear icon, to edit page content, click the pencil, and click the X to delete the selected page.