Change the Genesis Header Home Link

While I generally wouldn’t recommend linking to an external site from your header, on occasion, you may need to change the URL of the header home link. For example, if you have set up your WordPress install in a subdirectory as a secondary area of an already existing site, you may want the header URL to direct users back to your site’s main homepage. Changing it is simple.
[placement]

add_filter( 'genesis_seo_title', 'child_header_title', 10, 3 );
/**
 * Change default Header URL.
 *
 * @author Jen Baumann
 * @link http://dev.studiopress.com/change-header-link.htm
 *
 * @param string $title complete title including $wrap and $inside
 * @param string $inside contents of the $title with link and site name
 * @param string $wrap outer $title tags, may be h1 or h4
 * @return string
 */
function child_header_title( $title, $inside, $wrap ) {
	$inside = sprintf( '<a href="http://example.com/" title="%s">%s</a>', esc_attr( get_bloginfo( 'name' ) ), get_bloginfo( 'name' ) );
	return sprintf( '<%1$s id="title">%2$s</%1$s>', $wrap, $inside );
}

Remember to update the example.com value to your own.