A quick way to create pages is to
- click the new icon (circled as 1. in the image below) then
- dragging the 'new page' icon (circled as 2.) onto the page you want it inside (circled as 3. for this example).
- You will see the hovering tooltip (circled as 4.). Ensure that the icon looks like the one in the screenshot - this will make the new page a subpage of that page. If the arrow of the icon is pointing above or below the folder, it will put the new page before or after the page you are hovering over.
- Once the page has inserted, give it a name, then enable it by right clicking and choosing "Enable".