before you start with Power CMS Builder:
1) make sure your Dreamweaver site is configured for dynamic development.
see the "Defining a Dynamic Site in Dreamweaver" tutorial on the learning resources page:
2) Create a database connection. see the "Creating your database connection in Dreamweaver" tutorial also on the learning resources page
3) The pages you are working with must be php pages, they must have the file extension .php.
if you are working with static html page, you will have the problem you are describing. Power CMS Builder can only be applied to dynamic php pages.