this thread is talking about 2 different products:
Site Sculptor is a tool for creating your website layout. It is not intended as a tool for managing the website.
to manage the website once it has been created, Dreamweaver is the tool to use.
you can create a new page based on the site sculptor template, then you would need to edit the menus to add this new page to the navigation.
to do this, you would need to edit the menu on the Index page and the menu on the site assist template in the Templates directory.