To change your default theme, all you need to do is:

• Download the theme code (from a marketplace of some kind or GitHub)
• Open Cyberduck
• Open your Themes Folder (/var/www/ghost/content/themes)

• Drag the main theme folder over and wait for it to upload. Then it will appear like in the image above.
• Open your terminal or console and connect to your server.

Type

service ghost restart

• Then visit yourdomain.com/ghost
• On the settings page, scroll down and use the drop down menu to chance themes.