Adding post-meta information to 2012 theme

Hi there

I’m trying to add some post-meta information underneath the title of blog post. I am going into index.php and have put

<header class="entry-header">
<h1 class="entry-title"><?php _e( 'Nothing Found', 'twentytwelve' ); ?></h1>
By <?php the_author_posts_link(); ?> on <?php the_time('F jS, Y'); ?> in <?php the_category(', '); ?> <?php edit_post_link(__('{Edit}'), ''); ?>
</header>

as you can see in the header, but nothing is coming up.

My blog is http://www.atactilelife.com.au

Any idea what is going on?