Then you replace the design with a snippit of code that refers to the content and that content is then editable.
When it says you cannot add pages, that means that the end user cannot add pages. The developer can make any portion of any number of pages editable.
Cool. So it functions a little bit like Adobe's new trial service? I tried that but the client was too un-tech to be able to use Adobe's interface...
Once you add code to the pages, do they automatically show up in the admin area?