This widget will only appear on homepage.
Add 3 widgets under “Featured Items Header” widget.
Note: You cannot choose the image on your own, WordPress will automatically choose the featured image you upload or the first image of your post if you do not have featured image on your post or page.
Genesis Featured Post : You can display your latest blog post or specific post from all categories or specific category. You must attach a featured image (or at least 1 image) to the post so Genesis can automatically grab the image and display it here.
Follow this setting for genesis-featured post widget (see the red box) :