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// 2. Create a file called category-daily.php 
// (replace “daily” with the category slug of your choice), 
// and use the code below, which customizes the loop to display 
// the newsletter widget area after the 6th entry on the page:

// Add newsletter signup box after 6th entry.
add_action( 'genesis_after_entry', 'theme_newsletter_widget_area' );
function theme_newsletter_widget_area() {
	global $wp_query;
	$counter = $wp_query->current_post;
	if ( 5 == $counter ) {
		genesis_widget_area( 'newsletter', array(
			'before' => '<div class="newsletter">',
			'after'  => '</div>',
		) );
	}
}
// Run Genesis loop.
genesis();

// Register Newsletter widget area.
genesis_register_sidebar( array(
	'id'          => 'newsletter',
	'name'        => __( 'Newsletter', 'theme-name' ),
	'description' => __( 'This is the newsletter widget area.', 'theme-name' ),
) );