As of Genesis 3.0, the Primary Navigation Extras options have been removed. If you want to add a the date or a search form to a navigation menu, use the following code (see comments in the code snippet for further instruction).
Note: CSS Styling may be required when adding Navigation Extras and will be dependent on your theme. Any changes you wish to make to Navigation Extra display can be made to your child theme style.css file. See our FTP Guide to learn how to edit child theme files and upload the changes to your site.