The archive pages in Genesis can be a bit confusing. Other than the URL (and breadcrumbs if you have them turned on), they look exactly the same as the main blog.
Genesis provides a useful feature for adding headlines and intro text to the top of your archive pages. Go to Posts > Categories and edit a category to see the screenshot above. But this requires you to manually type it in for each category. If you have a lot of categories this can be a hassle.
Add this code to your theme’s functions.php to automatically default that field to your category name. If you provide an “Archive Headline” when editing a category, that is used. But if you don’t, the category name is used. This applies to categories, tags, and any custom taxonomies you’ve created.
Thanks Joshua Nelson for updating this code to work with the latest version of Genesis.