修改post.php

<?php if ($this->options->adContentPost != ""): ?>
                 <!--文章页脚的广告位-->
                 <?php $this->options->adContentPost(); ?>
<?php endif; ?>

在下面添加下面代码

<!-- 相关文章 -->
<div id="relatedPosts" style="box-shadow: 4px 6px 16px 0px #ddd; padding-left: 2rem; padding-top: 0.8rem; padding-bottom: 1.25rem;">
                    <h2>相关文章</h2>
                    <ul class="tocify-header nav nav-list">
                        <?php $this->related(10)->to($relatedPosts); ?>
                        <?php if ($relatedPosts->have()): ?>
                            <?php while ($relatedPosts->next()): ?>
                            <li class="tocify-item">
                                <a href="<?php $relatedPosts->permalink(); ?>" title="<?php $relatedPosts->title(); ?>"><?php $relatedPosts->title(); ?></a> 
                            </li>
                            <?php endwhile; ?>
                        <?php else : ?>
                        <li>无相关文章</li>
                        <?php endif; ?>
                    </ul>
</div>
<!-- end 相关文章 -->