Required: Genesis Framework, Genesis Simple Hooks plugin
Go to the Genesis > Simple Hooks menu. Go to the section called Document Hooks and find the subsection called genesis_before Hook. Paste the following code in the text box (if there is already code in the text box, paste this above it), make sure the checkbox labeled “Execute PHP on this hook?” is checked, and click Save Changes.
<?php
remove_action('genesis_before_header', 'genesis_do_nav');
add_action('genesis_after_header', 'genesis_do_nav');
?>