There is a part of code of  com_k2\templates\default\item.php :


<?php if($this->item->params->get('itemRelated') && isset($this->relatedItems)): ?>
  <!-- Related items by tag -->
 <div class="itemRelated">
  <h3><?php echo JText::_("Related items (by tag)"); ?></h3>
  <ul>
   <?php foreach($this->relatedItems as $key=>$item): ?>
   <li class="<?php echo ($key%2) ? "odd" : "even"; ?>">
    <a href="<?php echo $item->link ?>"><?php echo $item->title; ?></a>
   </li>
   <?php endforeach; ?>
  </ul>
  <div class="clr"></div>
 </div>
 <?php endif; ?>