there! I followed this post

Hi there! I followed this post
to get an idea about how to deal with a few options and, although with good explanations, I couldn't get the comments right on my site. I tried using this hook (comment_form) <?php do_action('comment_form', $post->ID); ?>
and managed to get the comments on the page, but I couldn't style it properly not make it work right as the other comment box from the theme is still appearing. Probably is something simple, but I just can't find what it is. Any help? Thanks