Hi Joohmla,
You can open the \templates\ja_vitality\html\mod_articles_category\highlight.php file, line 129.
Replace the following code:
<img src="<?php echo $introImage ;?>" alt="<?php echo $item->title; ?>" />
With this code:
<a href="<?php echo $item->link; ?>">
<img src="<?php echo $introImage ;?>" alt="<?php echo $item->title; ?>" />
</a>
