Create single.php in your themefolder and insert this code
get_header(); ?>
<div id="primary" class="content-area">
<div id="content" class="site-content" role="main">
<?php /* The loop */ ?>
<?php while ( have_posts() ) : the_post(); ?>
<?php get_template_part( 'content', get_post_format() ); ?>
<?php twentythirteen_post_nav(); ?>
<?php comments_template(); ?>
<?php endwhile; ?>
</div><!-- #content -->
</div><!-- #primary -->