OK. Delete your copy of includes/templates/YOUR TEMPLATE/tpl_product_info_display.php. Copy a fresh one from includes/templates/template_default/tpl_product_info_display.php. Add in the marketing text as described in

http://www.thatsoftwareguy.com/zenca...html#marketing

and put it at the bottom of the page. Then it should be sure to show up, unless you have used exclude_category or exclude_product. Then move the marketing text around to your taste.