Wanting to add Random Oderby to Template

Hi im running the template called Adirondack

And i really like it, but i need to edit the template so it orders the front page/featured page randomly.

I have look at some of the code, but i can’t find it…

index.php:

get_header(); ?>

<?php
	if ( is_front_page() && adirondack_has_featured_posts() ) {
		// Include the featured content template.
		get_template_part( 'featured-content' );
	}
?>

	<div id="primary" class="content-area">
		<main id="main" class="site-main" role="main">

		<?php if ( have_posts() ) : ?>

			<?php /* Start the Loop */ ?>
			<?php while ( have_posts() ) : the_post(); ?>

				<?php
					/* Include the Post-Format-specific template for the content.
					 * If you want to override this in a child theme, then include a file
					 * called content-___.php (where ___ is the Post Format name) and that will be used instead.
					 */
					get_template_part( 'content', get_post_format() );
				?>

			<?php endwhile; ?>

			<?php adirondack_paging_nav(); ?>

		<?php else : ?>

			<?php get_template_part( 'content', 'none' ); ?>

		<?php endif; ?>

		</main><!-- #main -->
	</div><!-- #primary -->

featured-content.php:

<?php
/**
 * The template for displaying featured content
 *
 * @package Adirondack
 */
global $in_featured;
$in_featured = true;
?>

<div id="featured-content" class="featured-content">
	<div class="featured-content-inner">
	<?php
		$featured_posts = adirondack_get_featured_posts();
		foreach ( (array) $featured_posts as $order => $post ) :
			setup_postdata( $post );

			 // Include the featured content template.
			get_template_part( 'content', 'featured-post' );

		endforeach;
		wp_reset_postdata();
		$in_featured = false;
	?>
	</div><!-- .featured-content-inner -->
</div><!-- #featured-content .featured-content -->