If moving the User registration files to the root works for you, than keep it that way.
if not, You can keep the user registration files in the subfolder if you wish, but while you are making changes to the login and creating the user level rules, you will need to change the Dreamweaver site definition so that the usrp folder is the root of the Dreamweaver site.
you should also create a few test page and apply the access rules to them in the usrp folder.
After the login has been changed and the rules are created, you can change the site definition back to the way it is now.
You will need to manually add the access rules to the pages in your site rather than using the access rules manager.
"pf Dreamweaver" is a typo for "of Dreamweaver"