Adding comment box and displaying comments on Homepage

Hello Everyone I am using the buddypress plugin and a theme called Rambles. Basically all I am trying to do is allow users to comment from the home page and let them see recently posted comments upon coming to the site. I am not “Great” at coding but have a little experience I have attached my code from index.php file for review, Any help is greatly appreciated!

<?php
/**
 * The main template file.
 *
 * @package Frontline
 * @since RadiumFramework 1.0.0
 */

get_header(); 

$options = get_option('radium_theme');

?>

<div id="main" class="<?php echo $radium_content_class; ?> clearfix" role="main">

	<div id="post-box">

		<?php if (have_posts()) : while (have_posts()) : the_post(); 

				$format = get_post_format();
				if( false === $format ) { $format = 'standard'; }
				if( $format == 'aside' || $format == 'gallery' || $format == 'image' || $format == 'link' || $format == 'quote') { }

			    get_template_part( 'lib/content/content', $format ); 

			endwhile; else : 

				get_template_part( 'lib/content/content', 'not-found' ); 

		 	endif; 

		echo radium_theme_pagination(); ?>

	</div> <!-- END #post-box -->

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

<?php get_footer(); ?>