[Plugin: Simple Facebook Connect] Comments not appearing

I tried putting the code you suggested in comments.php of but did not work. Perhaps you can and let me know where the code should be added?

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

    <?php
    $fields = array(
        'author' => '<p class="comment-form-author">' . '<label for="author">' . __('Name','responsive') . '</label> ' . ( $req ? '<span class="required">*</span>' : '' ) .
        '<input id="author" name="author" type="text" value="' . esc_attr($commenter['comment_author']) . '" size="30" /></p>',
        'email' => '<p class="comment-form-email"><label for="email">' . __('E-mail','responsive') . '</label> ' . ( $req ? '<span class="required">*</span>' : '' ) .
        '<input id="email" name="email" type="text" value="' . esc_attr($commenter['comment_author_email']) . '" size="30" /></p>',
        'url' => '<p class="comment-form-url"><label for="url">' . __('Website','responsive') . '</label>' .
        '<input id="url" name="url" type="text" value="' . esc_attr($commenter['comment_author_url']) . '" size="30" /></p>',
    );

    $defaults = array('fields' => apply_filters('comment_form_default_fields', $fields));

    comment_form($defaults);
    ?>

http://wordpress.org/extend/plugins/simple-facebook-connect/