[Plugin: WP-Paginate] Comments to be paginated not working

Hello, you have to excuse my English, but I have a problem with the layout of comments. The official FAQ explains to replace this:

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

With:

<?php if(function_exists('wp_paginate_comments')) {
    wp_paginate_comments();
} ?>

In my comment.php there is no code given. here’s my commnet.php

<?php // Do not delete these lines

if ('comments.php' == basename($_SERVER['SCRIPT_FILENAME']))

die ('Please do not load this page directly. Thanks!');

if (!empty($post->post_password)) { // if there's a password

if ($_COOKIE['wp-postpass_' . COOKIEHASH] != $post->post_password) {  // and it doesn't match the cookie

?>

<h3><?php _e("Questo post è protetto da password. Inserisci la password per visualizzare i commenti."); ?></h3>

<?php

return;

}

}

$commentalt = '_alt';

$commentcount = 1;

?>

<div id="comment-temps">
<h2><?php comments_number('Nessun utente a', '1 utente ha', '% utenti hanno' );?> commentato &quot; <?php the_title(); ?> &quot; </h2>

<p><!-- google adsense --></p>

<div class="post-fixed"></div>

<?php if ($comments) : ?>

<?php foreach ($comments as $comment) : ?>

<div class="com-box<?php echo $commentalt; ?>">

                        <div class="author_avatar"><?php if(function_exists('get_avatar')) { echo get_avatar($comment, '40'); } ?></div>

<div class="com-box-small">

            <div class="author_com"><?php comment_author_link(); ?> ha detto,</div>

            <div class="author_date">
            in <?php comment_date('F jS, Y') ?> alle <?php comment_time() ?> <?php edit_comment_link('modifica','',''); ?>
            </div>

            <div class="author_com_text">
            <?php comment_text() ?>
            </div>
            </div></div>

            <div class="com-fixed"></div>

<?php

($commentalt == "_alt")?$commentalt="":$commentalt="_alt";

$commentcount++;

?>

<?php endforeach; /* end for each comment */ ?>

<?php endif; ?>

<?php if ('open' == $post->comment_status) : ?>

<?php if (get_option('comment_registration') && !$user_ID) : ?>

<?php else : ?>

<?php if ($comment->comment_approved == '0') : ?>
<p><?php _e("Your comment is awaiting moderation."); ?></p>
<?php endif; ?>

<div class="com-fixed"></div>

<p><!-- google adsense --></p>

<h3>Commenta</h3>

<form action="<?php echo get_option('siteurl'); ?>/wp-comments-post.php" method="post">
<?php if (!$user_ID) : ?>
<div id="comment-box">
<p><input name="author" type="text" value="<?php echo $comment_author; ?>"/>&nbsp;Nome (obbligatorio)</p>
<p><input name="email" type="text" value="<?php echo $comment_author_email; ?>"/>&nbsp;Email (obbligatorio)</p>
<p><input name="url" type="text" value="<?php echo $comment_author_url; ?>"/>&nbsp;Sito Web (facoltativo)</p>
</div>
<?php endif; ?>

<div id="comment-area">
<p><textarea name="comment" cols="50%" rows="8"></textarea></p>
<p><input name="submit" type="submit" value="Invia il commento" />
<input type="hidden" name="comment_post_ID" value="<?php echo $id; ?>" /></p>
</div>
</form>
<span class="rssfeed">
<?php comments_rss_link('Avvisami via RSS della notifica di nuovi commenti'); ?></span>
<?php endif; // If registration required and not logged in ?>
<?php endif; // if you delete this the sky will fall on your head ?>
</div>

I tried adding the code does not work. can anyone help me? thanks