I have removed the header info from my site and expanded the right header widget to be full width. However I can not find anywhere to add styling to your menu. I want it to use the primary nav styling from this theme which you can still see on my site.
As this is a Genesis theme I cannot just go into the header.php and make code changes.
Any direction on how to make this work with a Genesis theme would be deeply appreciated.
It looks like you must be a member now to view that page, it used to be available to the public. I see that they still have their github code samples available though, hopefully those can point you in the right direction as well. https://gist.github.com/srikat/a4261bcbd0834dea4752
All of the built in methods to assign classes or IDs work just like normal (see above link for details).
To access these features you will need to use the wp_nav_menu function and not the widget. If you are trying to retrofit from an existing theme there is probably already a call to wp_nav_menu being made in your theme template files.