Author doesn’t display in posts

Hi,
First of all I’d like to thank you for the theme. It’s a great theme! However, I have a very minor issue. Whenever I post something the author is not showing. Not on the page feed, and neither on the post itself.

What I’ve tried is implementing

<?php if ($lw_post_author == "true" && is_attachment() != TRUE) : ?>
<div >
<div >
<?php echo get_avatar( get_the_author_id(), '28' ); ?>
</div>
<div >
<h4>
<?php _e('Author','lightword'); ?>: <a href="<?php the_author_url(); ?>"><?php the_author(); ?>
</a>
</h4>
<?php the_author_description(); if(!get_the_author_description()) _e('No description.
Please update your profile.','lightword'); ?>
</div>
<div >
</div>
</div>
<?php endif; ?>

after

<?php the_content(''); ?>

in single.php, but it did not work.