I think you've got the wrong end of the stick... :-S
you don't "upload into dreamweaver"..
All you have to do is Manage your site as you would if you were setting up a site normally..
Dreamweaver> (Top Menu)
Site>Manage Sites> New
From there you define your site (location/ftp/php/etc..) as you would normally, but just point it towards the downloaded powerstore folder (i.e make the powerstore folder the "Root" folder for your new site!)
Hope this helps!.. ;-)