Hello!
Please edit [Joomla dir]\components\com_hotornot\views\show\tmpl\default.php and add on line 58 (or wherever you want the current rating displayed) the following:
<?php echo $this->image['rank']; ?><img src="http://localhost/hotornot_deluxe_310/components/com_hotornot/assets/images/star_on.png" class="hotornot-icon3">