posts_nav_link not working!

hi
here is my code:

<?php
/*
Template Name: News
*/
get_header();?>
<h1 class="title">news</h1>
<div class="border"></div>
<section class="page news col-md-11">
<?php
$latest_blog_posts = new WP_Query( array( 'posts_per_page' => 1, 'cat' => 6 ) );
if ( $latest_blog_posts->have_posts() ) :
	while ( $latest_blog_posts->have_posts() ) :
		$latest_blog_posts->the_post();
?>
<div class="post">
		<a href="<?php the_permalink(); ?>">
			<?php the_title( '<h1 class="entry-title">', '</h1>' ); ?>
		</a>
<?php
		the_post_thumbnail( array(500, 500) );
		the_content( sprintf(
		__( '(more)'),
		the_title( '<span class="screen-reader-text">', '</span>', false )
	) );
?>
</div>
<?php
	endwhile;
endif;
?>
</section>
<?php posts_nav_link(); ?>

<?php get_footer(); ?>

but posts_nav_link() function not working!
sorry my english is poor.