我无法给出确切的上下文答案，因为您尚未提供代码，但是下面列出的函数（使用示例）应该满足您的要求。

On each blog post on the index.php page I want to display the authors name and image.

<a href="<?php echo get_author_posts_url(get_the_author_meta(\'ID\')); ?>">
    <?php
    echo get_avatar(get_the_author_meta(\'ID\'));
    the_author_meta(\'display_name\');
    ?>
</a>

I also need to show the authors bio at the bottom of every single.php post he posts.

echo get_the_author_meta(\'description\');