There is lots of customization required for featured images clickable. I suggest first create child themes otherwise you can do like follows…
1. Take backup of featured-box.php then open this file.
2. comment out all code between
<div class=”featured-boxs”>
</div>
3. if you have three/6 featured image then you have to repeat following code three/6 time
<span class=”featured-box”>
<h2><?php echo of_get_option(‘featured01-title’ . 1, ‘Featured’); ?><span> <?php echo of_get_option(‘featured02-title’ . 1, ‘Image’); ?></span></h2>
<img src=”<?php echo of_get_option(‘featured-image’ . 1, get_template_directory_uri() . ‘/images/featured-image’. 1 . ‘.jpg’); ?>”/>
<p><?php echo of_get_option(‘featured-description’ . 1, ‘A Smart way of Natural Presence. This is a Test Description and you can change it from the Theme Options.’); ?></p>
</span>
for second time 1 becomes 2 and <a href =”your page link” before img tag