Wordpress website in Dreamweaver

In addition to what has already been said, have a look at this blog article from Adobe.

Establishing a Dreamweaver CC and WordPress Workflow | Creative Cloud blog by Adobe

All the best!

Thanks,

Preran

Refer to WordPress documentation for Theme Developers.  You'll need to understand how to work with Themes and more specifically Child Themes to protect your changes.

Getting Started | Theme Developer Handbook | WordPress Developer Resources

I also advise you to read the  documentation that accompanied your purchased Theme.  Premium Themes often provide options for customizing logo, colors, backgrounds, etc... directly from the WordPress Admin Panels which is far less risky and easier than working with complex code.

Nancy

1) install all-in-one WP migration on your site (or perhaps another backup tool is already installed by the developer?) Download a backup of the entire site with this.

2) install a new WP installation on your local machine (you should have WAMP (win) or XAMPP (win/mac) or MAMP (mac) running on your local machine, of course)

3) install the same all-on-one WP migration plugin in the new local WP installation, and open the site backup.

4) use a code editor to make changes to the theme files in the wp-content/themes folder in your localhost copied version.

5) test, test, test

6) upload the revised theme files to your live site with FTP.

Done!

If you know how to edit your theme files using notepad or any other simple text editor, then yes, you can edit it in Dreamweaver, but don't expect DW to provide an ability to edit that doesn't require you to know HTML, CSS, and a little PHP.