How do I add styles to my page with an external CSS file?

CSS files are much easier to create in Dreamweaver. In the main menu, select Text > CSS Styles > New Style Sheet. This will pop up a dialogue box. Name your CSS file and the style you want to define, and you will get another dialogue containing options for all the most common CSS atributes. When you close the CSS window, the new file will be saved in your site's root directory.

When you want to apply the new style to any of the pages on your site, it will appear as an option under Text > CSS Styles.