Arclite Theme – Missing author in posts

Fixed my own problem.

I went into index.php and copied the author code from there into single post php

This is what I added and it worked:

<div class="post-header">
           <p class="post-date">
            <span class="month"><?php the_time(__('M','arclite')); ?></span>
            <span class="day"><?php the_time(__('j','arclite')); ?></span>
           </p>
           <p class="post-author">
            <span class="info"><?php printf(__('Posted by %s in %s','arclite'),'<a href="'. get_author_posts_url(get_the_author_ID()) .'" title="'. sprintf(__("Posts by %s","arclite"), attribute_escape(get_the_author())).' ">'. get_the_author() .'</a>',get_the_category_list(', '));?>
            </span>
           </p>
          </div>