The files are in your users configuration folder. Are you on a MAC or PC? The path is different in each.
The edit button shows in the properties window when you select the script tag after the menu on the page. First make sure the properties panel is open by selecting Window->Properties. Then make sure that script hidden elements are displayed on the page by editing your Dreamweaver Preferences. Then it should be just a matter of clicking on the element after the menu on the page in design view.