you dont need to install HTML Editor if you fopllow the steps outlined in my previous post.
If you do install the HTML Editor, you can edit the styles list on the Styling tab.
see the HTML Editor support page, the getting started guide will have more details.
After you have edited the pages using HTML Editor, you will need to upload them, to the server so that the client can see the changes.
HTML Editor is a Dreamweaver extension, it is a tool that can be used to create a content management system such as PowerCMS. PowerCMS is an already built application