Older newer post link not showing – sight theme

Hi,

I am using the sight theme and in the demo is shows a link to older posts at the bottom.
However since I set it up it only shows the first posts and I cannot navigate to the older posts. Basically the blog only shows the first posts without access to previous posts.

Can anyone help me to set this up and if yes where I need to add the code?

Many thanks

<?php get_header(); ?>

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

<div class=”entry”>
<div <?php post_class(‘single clear’); ?> id=”post_<?php the_ID(); ?>”>
<div class=”post-meta”>
<h1><?php the_title(); ?></h1>
<?php printf(__(‘by <span class=”post-author”>%s</span> on <span class=”post-date”>%s</span> • <span>%s</span>’, ‘sight’),
get_author_posts_url(get_the_author_meta(‘ID’)),
get_the_author(),
get_the_author(),
get_the_time(‘M j, Y’),
get_the_time()
); ?>
<?php edit_post_link( __( ‘Edit entry’, ‘sight’), ‘• ‘); ?>
<?php if (comments_open()): ?>
<?php comments_number(__(‘No Comments’, ‘sight’), __(‘1 Comment’, ‘sight’), __(‘% Comments’, ‘sight’), ”, __(‘Comments Closed’, ‘sight’) ); ?>
<?php endif; ?>
</div>
<div class=”post-content”><?php the_content(); ?></div>
<div class=”post-footer”><?php the_tags(‘‘.__(‘Tags:’, ‘sight’).’ ‘, ‘, ‘); ?></div>
</div>
</div>

<?php endwhile; ?>
<?php endif; ?>

<?php comments_template(); ?>

<?php get_footer(); ?>