Deborah seamlessly integrates its options into live preview customizer. You can set up your site's title, tagline and logo, home and blog page, manage menus and widgets, customize colors, layout, typography and others.
Customizer can be accessed at Appearance → Customize. All the changes you make in Customizer will be immediately displayed in the preview, but they will be made live only after you press the Publish button.
At Appearance → Customize → Theme Options panel you'll find theme-specific options. Check them out to get familiar with theme customization capabilities.