But I think I am still missing something. Following what I have done what have I created? I used Insert as there was no edit option. But no page has been created. If I follow the same path my previous alterations to the selected layout are saved. But no new page is created. After using Edit I pressed Finish and Done.
I have managed to make a modified page. I selected New CSS Sculptor Page. I next chose under Presets, Choose a preset layout,. then I selected the layout I had modifiied and sure enough I had created the new page according to my modifications. :)