FTP로 접속해서 /wp-content/plugins/kboard/skin/사용하는 스킨/document.php 파일에서 아래 코드를 찾으신 후

<div class="detail-attr detail-writer">
	<div class="detail-name"><?php echo __('Author', 'kboard')?></div>
	<div class="detail-value"><?php echo $content->getUserDisplay()?></div>
</div>

아래 코드처럼 교체해 보시겠어요?

<?php if($content->notice):?>
<div class="detail-attr detail-notice">
	<div class="detail-name">공지사항</div>
</div>
<?php endif?>

<div class="detail-attr detail-writer">
	<div class="detail-name"><?php echo __('Author', 'kboard')?></div>
	<div class="detail-value"><?php echo $content->getUserDisplay()?></div>
</div>

고맙습니다.