Open up the single.php file and copy/paste the code below after the closing tag for the show_social function. In this example, the last div class labeled linked-in actually just refers to the author link. We labeled it that way because the contributing authors use linkedin profile links so it was easy to reference for css.
<?php if ($show_author_info) { ?>
<div class="author-info-wrap clearfix">
<div class="author-avatar"><?php if(function_exists('get_avatar')) { echo get_avatar(get_the_author_meta('ID'), '164'); } ?></div>
<div class="post-info">
<div class="author-name"><span><?php _e("Posted by", "swiftframework"); ?></span><a><?php the_author_meta('display_name'); ?></a></div>
<div class="post-date"><?php echo $post_date; ?></div>
<div class="description"><?php echo get_the_author_meta('description'); ?></div>
<div class="linked-in">Connect with <?php the_author_link(); ?></div></div></div>
<?php } ?>
.