Post Author not showing up in Posts….HELP

this is the code in index.php to show the data below the post title on the front page:

<span class="index-meta"><?php _e('Date: ', 'js-o4w'); ?><?php the_time('Y.m.d') ?> | <?php _e('Category: ', 'js-o4w'); ?><?php the_category(', ') ?> | <?php _e('Response: ', 'js-o4w'); ?><?php comments_number('0','1','%'); ?></span>

and this is the code from single.php:

<span class="index-meta"><?php _e('Date: ', 'js-o4w'); ?><?php the_time('Y.m.d') ?> | <?php _e('Category: ', 'js-o4w'); ?><?php the_category(', ') ?> | <?php _e('Tags: ', 'js-o4w'); ?><?php the_tags(' ', ',', ' '); ?></span>

similar code is in archive.php.

here is some code to add a possible author info:
<?php the_author_posts_link(); ?>
http://codex.wordpress.org/Function_Reference/the_author_posts_link
related:
http://codex.wordpress.org/Function_Reference/the_author

for more suggestions, you need to define first, where you want to add the author info into the existing data.