No, the site Sculptor wizard is not intended for managing the site after it is created. Th Site Sculptor wizard is a creation tool, not a management tool.
To make changes to the site design, you would need to edit the Template that is used for the site, or the index page if you want to edit the home page.
to add CMS to the site, you can use the Power CMS Builder tools of design Extender. in order to add CMS, the site would need to be a dynamic site to begin with using the .php file extension for the pages.
On one of the site pages, select the content you want to convert to CMS, then go to WebAssist -> CMS -> Add content to Power CMS.