I know there's a way to open a SCCD theme in Dreamweaver and edit it manually, but how do I do it?

Find your theme's .sct file.
1. Make a backup copy of it before the next step.
2. Change it's extension to .zip (Right click change name).
3. unzip it to a different location.
4. Now edit this theme to your needs.
5. Now zip it back up.
6. Change the extension back to .sct.
7. Import into shop.

Thank you