Hi Francus,
You can open the file:
/templates/ja_space/html/com_content/categories/default_items.php
Look for this line of code:
<img src="<?php echo $item->getParams()->get('image'); ?>"/>
change it to:
<a href="<?php echo JRoute::_(ContentHelperRoute::getCategoryRoute($item->id));?>">
<img src="<?php echo $item->getParams()->get('image'); ?>"/>
</a>
It will look like this:
