Say you have a folder located at c:\websites\powerstore
You use you favorite file utility (i.e. Windows Explorer) to copy all of the files from the Solution Pack into that directory.
Create a site definition in DreamWeaver pointing to your folder:
Creating a dynamic site definition in Dreamweaver
Use Dreamweaver to modify your copy of PowerStore. You should never edit the original files.
You can then use Dreamweaver to upload your site to your web server or, even better a stand-alone FTP program.