Post and pages use the featured image option. Follow these steps if you want to display a picture above the title of the post or page.
Content Archive Settings
Navigate to Genesis > Theme Settings. Be sure the followings options are set under Content Archives.
Activate the ‘Include the featured image’ option. The image size must be set at ‘featured (800 x 500)’. Set image alignment at ‘none’.
Create post or page
Create a new post or page. Scroll down in the right sidebar until you see the option Featured Image. Push the ‘Set featured image’ link and select or upload an image of your choice. Add a title and content to the page and click ‘Publish’.