플러그인을 설치하지 않고,
index.php에 관련 코드를 삽입하고, 코드를 좀 조절해 주니 해결이 되었습니다.
아래는 해당 내용입니다.
1. site admin->Presentation->Theme Editor->Main Index Template(: index.php)
의 49줄의 다음과 같은 문맥
<?php edit_post_link(‘Edit’,”,'<strong>|</strong>’); ?>
<?php comments_popup_link(‘No Comments’, ‘1 Comment’, ‘% Comments’); ?>
밑에 다음을 추가합니다.

<?php
global $wpdb, $tablecomments, $post;
$comments = $wpdb->get_results(“SELECT * FROM $tablecomments WHERE comment_post_ID = ‘$post->ID’ AND comment_content NOT LIKE ‘%<trackback />%’ AND comment_content NOT LIKE ‘%<pingback />%’ AND comment_approved = ‘1’”);
include(TEMPLATEPATH . ‘/comments_main.php’); // Display comments
?>

2. site admin->Presentation->Theme Editor->style.php
의 235 줄의 .center-widget-title {…}
설정 이후에 다음을 추가합니다.
.center-widget-title-main {
color:<?php tiga_widgetTitleFontColor(CENTER); ?>;
background-color:<?php tiga_widgetTitleBgColor(CENTER); ?>;
border-color:<?php tiga_widgetBorderColor(CENTER); ?>;
margin-left: 0 px;
margin-right: 0 px;
border-width:1px 1px 0px 1px;
border-style:solid;
font-size:9pt;
font-weight: bold;
padding:5px;
}

.center-widget-main {
border-color:<?php tiga_widgetBorderColor(CENTER); ?>;
margin-left: 0 px;
margin-right: 0 px;
color:#000000;
background-color:#FFFFFF;
border-width: 1px;
border-style:solid;
padding:1em;
margin-bottom:5px;
font-size:10pt;
}
3. 콘솔모드에서 다음 파일을 생성(: /WEDI1/blog.ebiz/wordpress/wp-content/themes/tiga>comments_main.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
?>

<p class=”nocomments”>This post is password protected. Enter the password to view comments.<p>

<?php
return;
}
}

/* This variable is for alternating comment background */
$oddcomment = ‘alt’;
?>

<!– You can start editing here. –>
<?php if ($comments) : ?>

<div class=”center-widget-title-main”><?php comments_number(‘No Responses’, ‘One Response’,

‘% Responses’); ?> </div>
<div class=”center-widget-main”>
<div class=”comment-list”>
<?php
$comment_num = 1;
foreach ($comments as $comment) :
?>
<div class=”<?php if ($oddcomment) echo “odd-comment”; else echo “even-comment”; ?>” id=”comment-<?php comment_ID() ?>”>
<div class=”comment-header”>
<div class=”clearfix”>
<!– gravatar plugin – http://www.gravatar.com/plugins/wp_gravatar.zip –>
<?php if (function_exists(‘gravatar’)) { ?>
<a target=”_blank” href=”http://www.gravatar.com&#8221; title=”Add your own user icon”>
<img class=”gravatar” src=”<?php gravatar(‘G’, 36, get_bloginfo(‘template_url’). ‘/images/anon.jpg’); ?>” alt=”” height=”36″ width=”36″/>
</a>
<?php } ?>
<!– gravatar plugin – end –>
<div class=”comment-meta”>
<cite><?php comment_author_link() ?></cite> says:
<?php if ($comment->comment_approved == ‘0’) : ?>
<em>Your comment is awaiting moderation.</em>
<?php endif; ?>

<span class=”comment-date”>
<?php comment_date(‘`y m/j’) ?> at <?php comment_time() ?>
</span> <!– comment-date –>

<span class=”comment-edit-link”>
<?php edit_comment_link(‘edit’,”,”); ?>
</span> <!– comment-edit-link –>
</div> <!– comment-meta –>
</div> <!– clear-fix –>
</div> <!– comment-header –>
<div class=”comment-text”><?php comment_text() ?></div>
</div>

<?php /* Changes every other comment to a different class */
if (‘alt’ == $oddcomment) $oddcomment = ”;
else $oddcomment = ‘alt’;
?>

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

</div> <!– comment-list –>
</div> <!– center-widget –>
<?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 ?>
<!– If comments are closed. –>
<?php endif; ?>
<?php endif; ?>
<?php if (‘open’ == $post->comment_status) : ?>
<?php endif; // if you delete this the sky will fall on your head ?>