Change this code of content.php template
line 29 to 33
<span class="author">
<?php echo the_author_posts_link(); ?>
</span>
<span class="meta-sep">|</span>
<?php echo get_the_date(); ?>
for this:
<span class="vcard author">
<span class="fn"><?php echo the_author_posts_link(); ?></span>
</span>
<span class="meta-sep">|</span>
<span class="date updated"><?php echo get_the_date(); ?></span>