To create a new page, simply go to the end of the page that will be the preceding page of the new page. Enter the heading and format it with the online editor as h1, h2 or h3, depending which navigation level you want to assign to your new page.
After saving your input, CMSimple will create the new page. Now you can navigate to this page and enter your content.
You can delete a CMSimple page by going to the page, deleting everything in edit mode and saving the empty page.
CMSimple 4.0 and higher also has a pagemanager, which you can call via the menu item "pages" in the admin menu. With the Page Manager you can create and delete pages and move entire branches (with all subpages).
It also is possible to use the pagemanager to hide pages from the navigation menu and publish again.
Changes will only be effective, if you click the "save" button below the pagemanager.