Help finding Hook Location

Can you help me find the name of my hooks for installation:

<?php
/**
* @package WordPress
* @subpackage U-Design
*/

// Do not delete these lines
if (!empty($_SERVER['SCRIPT_FILENAME']) && 'comments.php' == basename($_SERVER['SCRIPT_FILENAME']))
die ('Please do not load this page directly. Thanks!');

if ( post_password_required() ) { ?>
<p class="nocomments"><?php esc_html_e('This post is password protected. Enter the password to view comments.', 'udesign'); ?></p>
<?php
return;
}
?>

<!-- You can start editing here. -->

<?php if ( have_comments() ) : ?>
<h5 id="comments"><?php comments_number( __( 'No Responses', 'udesign' ), __( '1 Comment', 'udesign' ), __( '% Comments', 'udesign' ) );?></h5>

<div class="clear"></div>

<ol class="commentlist">
<?php wp_list_comments('type=comment&callback=mytheme_comment'); ?>

<div class="clear"></div>

<?php // pagination
if(function_exists('wp_commentnavi')) :
wp_commentnavi();
else : ?>
<div class="navigation">
<div class="alignleft"><?php previous_comments_link() ?></div>
<div class="alignright"><?php next_comments_link() ?></div>
</div>
<?php endif; ?>
<?php else : // this is displayed if there are no comments so far ?>

<?php if ( comments_open() ) : ?>
<!-- If comments are open, but there are no comments. -->

<?php else : // comments are closed ?>
<!-- If comments are closed. -->
<p class="nocomments"><?php esc_html_e('Comments are closed.', 'udesign'); ?></p>

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

<?php if ( comments_open() ) : ?>

<div id="respond">

<h5><?php comment_form_title( __( 'Leave a Reply', 'udesign' ), __( 'Leave a Reply to %s', 'udesign' ) ); ?></h5>

<div class="cancel-comment-reply">
<small><?php cancel_comment_reply_link(); ?></small>
</div>

<?php if ( get_option('comment_registration') && !is_user_logged_in() ) :
printf( __('<p>You must be logged in to post a comment.</p>', 'udesign' ), wp_login_url( get_permalink()) );
else : ?>

<form action="<?php echo get_option('siteurl'); ?>/wp-comments-post.php" method="post" id="commentform">

<?php if ( is_user_logged_in() ) : ?>

<p><?php printf( __('Logged in as %2$s.', 'udesign' ), get_option('siteurl'), $user_identity ); ?> " title="<?php esc_html_e('Log out of this account', 'udesign'); ?>"><?php esc_html_e('Log out »', 'udesign'); ?></p>

<?php else : ?>

<p><input type="text" name="author" id="author" value="<?php echo esc_attr($comment_author); ?>" size="22" tabindex="1" <?php if ($req) echo "aria-required='true'"; ?> />
<label for="author"><small><?php esc_html_e('Name', 'udesign'); ?> <?php if ($req) esc_html_e('(required)', 'udesign'); ?></small></label></p>

<p><input type="text" name="email" id="email" value="<?php echo esc_attr($comment_author_email); ?>" size="22" tabindex="2" <?php if ($req) echo "aria-required='true'"; ?> />
<label for="email"><small><?php esc_html_e('Mail (will not be published)', 'udesign'); ?> <?php if ($req) esc_html_e('(required)', 'udesign'); ?></small></label></p>

<p><input type="text" name="url" id="url" value="<?php echo esc_attr($comment_author_url); ?>" size="22" tabindex="3" />
<label for="url"><small><?php esc_html_e('Website', 'udesign'); ?></small></label></p>

<?php endif; ?>

<!--<p><small>XHTML: You can use these tags: <?php echo allowed_tags(); ?></small></p>-->

<p><textarea name="comment" id="comment" cols="100%" rows="10" tabindex="4"></textarea></p>

<p><input name="submit" type="submit" id="submit" tabindex="5" value="<?php esc_attr_e('Submit Comment', 'udesign'); ?>" />
<?php comment_id_fields(); ?>
</p>
<?php do_action('comment_form', $post->ID); ?>

</form>

<?php endif; // If registration required and not logged in ?>
</div>

<?php endif; // if you delete this the sky will fall on your head ?>

Thank!