기존에 답변해 주신 방법들로 해서 list.php 파일을 수정하려고 열어보니

아무리 찾아도 이 코드가 없습니다.

(<a href="<?php echo $url->set('uid', $content->uid)->set('mod', 'document')->toString()?>">)

게시판 스킨은 오션별점 스킨입니다.

이럴 경우 어떻게 해야 할까요?

제가 연 list.php 파일은 이렇습니다.

<div id="kboard-ocean-rating-list">
    <div class="kboard-header">
        <!-- 카테고리 시작 -->
        <?php
        if($board->use_category == 'yes'){
            if($board->isTreeCategoryActive()){
                $category_type = 'tree-select';
            }
            else{
                $category_type = 'default';
            }
            $category_type = apply_filters('kboard_skin_category_type', $category_type, $board, $boardBuilder);
            echo $skin->load($board->skin, "list-category-{$category_type}.php", $vars);
        }
        ?>
        <!-- 카테고리 끝 -->
    </div>
    
    <!-- 리스트 시작 -->
    <ul class="kboard-list">
    <?php while($content = $list->hasNext()):?>
        <li class="kboard-list-item">
            <div class="kboard-wrap-left">
                <?php if($content->getThumbnail(70, 70)):?>
                    <img src="<?php echo $content->getThumbnail(70, 70)?>" alt="<?php echo esc_attr($content->title)?>">
                <?php else:?>
                    <?php echo get_avatar($content->member_uid, 70, '', $content->member_display)?>
                <?php endif?>
            </div>
            <div class="kboard-wrap-center">
                <div class="kboard-item-title kboard-ocean-rating-cut-strings"><a href="<?php echo $url->getDocumentURLWithUID($content->uid)?>"><?php echo $content->title?> <span class="kboard-rating value-<?php echo $content->option->rating?>" title="<?php echo $content->option->rating?>"></span></a></div>
                <div class="kbaord-item-rating"><span class="kboard-rating value-<?php echo $content->option->rating?>" title="<?php echo $content->option->rating?>"></span></div>
                <div class="kboard-item-content kboard-ocean-rating-cut-strings"><a href="<?php echo $url->getDocumentURLWithUID($content->uid)?>"><?php echo strip_tags($content->content)?></a></div>
                <div class="kboard-item-info">
                    <span><?php echo apply_filters('kboard_user_display', $content->getUserName(), $content->getUserID(), $content->getUserName(), 'kboard', $boardBuilder)?></span> |
                    <?php echo date("Y.m.d", strtotime($content->date))?>
                </div>
            </div>
            <div class="kboard-wrap-right">
                <div class="kboard-right kboard-item-like"><div class="kboard-item-padding"><?php echo __('Votes', 'kboard')?> : <span class="kboard-count-bold"><?php echo $content->like?></span></div></div>
                <div class="kboard-right kboard-item-comment"><div class="kboard-item-padding">답변 : <span class="kboard-count-bold"><?php $comment = $content->getCommentsCount('',''); echo $comment?$comment:'0';?></span></div></div>
                <div class="kboard-right kboard-item-view"><div class="kboard-item-padding"><?php echo __('Views', 'kboard')?> : <span class="kboard-count-bold"><?php echo $content->view?></span></div></div>
            </div>
        </li>
    <?php endwhile?>
    </ul>
    <!-- 리스트 끝 -->
    
    <!-- 페이징 시작 -->
    <div class="kboard-pagination">
        <ul class="kboard-pagination-pages">
            <?php echo kboard_pagination($list->page, $list->total, $list->rpp)?>
        </ul>
    </div>
    <!-- 페이징 끝 -->
    
    <!-- 검색폼 시작 -->
    <div class="kboard-search">
        <form id="kboard-search-form-<?php echo $board->id?>" method="get" action="<?php echo $url->toString()?>">
            <?php echo $url->set('pageid', '1')->set('target', '')->set('keyword', '')->set('mod', 'list')->toInput()?>
            
            <select name="target">
                <option value=""><?php echo __('All', 'kboard')?></option>
                <option value="title"<?php if(kboard_target() == 'title'):?> selected<?php endif?>><?php echo __('Title', 'kboard')?></option>
                <option value="content"<?php if(kboard_target() == 'content'):?> selected<?php endif?>><?php echo __('Content', 'kboard')?></option>
                <option value="member_display"<?php if(kboard_target() == 'member_display'):?> selected<?php endif?>><?php echo __('Author', 'kboard')?></option>
            </select>
            <input type="text" name="keyword" value="<?php echo kboard_keyword()?>">
            <button type="submit" class="kboard-ocean-rating-button-small"><?php echo __('Search', 'kboard')?></button>
        </form>
    </div>
    <!-- 검색폼 끝 -->
    
    <?php if($board->isWriter()):?>
    <!-- 버튼 시작 -->
    <div class="kboard-control">
        <a href="<?php echo $url->getContentEditor()?>" class="kboard-ocean-rating-button-small"><?php echo __('New', 'kboard')?></a>
    </div>
    <!-- 버튼 끝 -->
    <?php endif?>
    
    <?php if($board->contribution()):?>
    <div class="kboard-ocean-rating-poweredby">
        <a href="https://www.cosmosfarm.com/products/kboard" onclick="window.open(this.href);return false;" title="<?php echo __('KBoard is the best community software available for WordPress', 'kboard')?>">Powered by KBoard</a>
    </div>
    <?php endif?>
</div>