Where To Add Hooks?

Here is my code for comments.php

Where to add the hooks from the Comments Plus plugin?

Thank you for help!

// 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">This post is password protected. Enter the password to view comments.</p>

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

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

<h3 class="comm"><?php comments_number('No Responses', 'One Response', '% Responses' );?> to “<?php the_title(); ?>”</h3>

<ol class="commentlist">
<?php wp_list_comments('avatar_size=48'); ?>

<div class="navigation">
<div class="alignleft"><?php previous_comments_link() ?></div>
<div class="alignright"><?php next_comments_link() ?></div>
<div class="fix"></div>

<?php else : // this is displayed if there are no comments so far ?>
<?php if ('open' == $post->comment_status) : ?>
<!-- If comments are open, but there are no comments. -->

<?php else : // comments are closed ?>
<div id="comments_wrap">
<!-- If comments are closed. -->
<p class="nocomments">Comments are closed.</p>
</div> <!-- end #comments_wrap -->

<?php endif; ?>

<?php endif; ?>

<div id="respond">
<?php if ('open' == $post->comment_status) : ?>

<h3><?php comment_form_title( 'Add Your Opinion', 'Leave a Reply to %s' ); ?></h3>

<?php if ( get_option('comment_registration') && !$user_ID ) : ?>
<p>You must be /wp-login.php?redirect_to=<?php echo urlencode(get_permalink()); ?>">logged in to post a comment.</p>

<?php else : ?>

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

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

<?php if ( $user_ID ) : ?>

<p class="logged-in">Logged in as /wp-admin/profile.php"><?php echo $user_identity; ?>. " title="Log out of this account">Log out »</p>

<p><textarea class="textarea" name="comment" id="comment" style="width:95%" rows="10" tabindex="4"></textarea></p>

<?php else : ?>

<div class="fieldset">

<div class="field">

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

<div class="field">

<input class="text" type="text" name="email" id="email" value="<?php echo $comment_author_email; ?>" size="22" tabindex="2" <?php if ($req) echo "aria-required='true'"; ?> />
<label for="email">Email <?php if ($req) echo "(required)"; ?></label>

<div class="field">

<input class="text" type="text" name="url" id="url" value="<?php echo $comment_author_url; ?>" size="22" tabindex="3" />
<label for="url">Website</label>

<div class="field">

<textarea class="textarea" name="comment" id="comment" style="width:95%" rows="10" tabindex="4"></textarea>



<?php endif; // If logged in ?>

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

<p class="submit"><input class="btinput" name="submit" type="submit" id="submit" tabindex="5" value="Submit" /></p>

<input type="hidden" name="comment_post_ID" value="<?php echo $id; ?>" />

<?php comment_id_fields(); ?>
<?php do_action('comment_form', $post->ID); ?>


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

<?php endif; // if you delete this the sky will fall on your head ?>
</div> <!-- end #respond -->