functions.php

// Register Horizontal Opt-in widget area
genesis_register_widget_area(
	array(
		'id'          => 'horizontal-opt-in',
		'name'        => __( 'Horizontal Opt-in', 'my-theme-text-domain' ),
		'description' => __( 'This is the horizontal opt-in section.', 'my-theme-text-domain' ),
	)
);

// Display Horizontal Opt-in widget area below header
add_action( 'genesis_after_header', 'sk_horizontal_optin' );
function sk_horizontal_optin() {
	genesis_widget_area( 'horizontal-opt-in', array(
		'before'	=> '<div class="horizontal-opt-in widget-area"><div class="wrap">',
		'after'		=> '</div></div>',
	) );
}