The best I can tell, the slider picks four random products to display on the main page
Check the read me included with this template under "customize slider" and you will find the following
Code:
Change the Slider Images and Links
1 - Create new images in your favorite image editor (standard size is 775 pixals wide by 325 pixals tall)
2 - Upload the images to includes/templates/azienda/images/
3 - Open includes/languages/english/html_includes/azienda/define_main_page.php and you will see code at the top:
define('SLIDE_ONE', 'slide1.jpg');
define('SLIDE_TWO', 'slide2.jpg');
define('SLIDE_THREE', 'slide3.jpg');
define('SLIDE_FOUR', 'slide4.jpg');
define('SLIDE_ONE_URL', 'http://www.brandonturpin.com');
define('SLIDE_TWO_URL', 'http://www.brandonturpin.com');
define('SLIDE_THREE_URL', 'http://www.brandonturpin.com');
define('SLIDE_FOUR_URL', 'http://www.brandonturpin.com');
4 - Change the slide1.jpg to the title of your slide image
5 - Change the url to where you want them directed when it is clicked.