These should already be set up by the theme onboarding, but you can change them if you like.
In the WordPress dashboard, go to Genesis > Theme Settings.
You will be taken to the Customizer.
When you are at Appearance > Customize, you can click on Theme Settings.
You can customize
- Child Theme Specific Settings
- Site Layout
- Comments and Trackbacks
- Singular Content
- Content Archives
- Header/Footer Scripts
More details are in each link.
When you're finished, click the Publish button at the top of the Customizer.