in your page.php which has this code
<?php get_header() ?>
<div id="content"><div id="content-in">
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
<div id="post-<?php the_ID(); ?>" class="post">
<h3 class="title"><?php the_title(); ?></h3>
<div class="meta clearfix">
<span class="date-post">Posted on <?php the_time('F j Y') ?></span> <span class="author-post">by <?php the_author() ?></span>
</div>
<div class="entry">
<?php the_content(''); ?>
</div>
<?php wp_link_pages(array('before' => '<p><strong>Pages:</strong> ', 'after' => '</p>', 'next_or_number' => 'number')); ?>
<div class="clear"></div>
</div>
<?php endwhile; ?>
<?php comments_template(); ?>
<?php else: ?>
<h2 class="center">Not Found</h2>
<p class="center">Sorry, but you are looking for something that isn't here.</p>
<?php endif ?>
<?php get_sidebar(); get_footer() ?>
You could clearly see
<?php the_content(''); ?>
Put what ever you want before and after that line.
I hope it will help.