Inserting adsense into my post

Hopefully everyone is having a good weekend. Im trying to insert adsense into my blog posts like in this website.http://energy.seekingalpha.com/article/24678
But i do not know where to inset the adsense code or what else do I need? anyone kind enough to help me im new to coding. Below is the php of the code for a single post. I think thats where it suppose to go.thanks in advance
-Alex
www.wslounge.com

<?php get_header(); ?>

	<div id="content_box">
	
		<div id="content" class="pages">

			<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
			
			<h2><?php the_title(); ?></h2>	
			<div class="entry">	

				<?php the_content('<p>Read the rest of this page &rarr;</p>'); ?>
				<?php link_pages('<p><strong>Pages:</strong> ', '</p>', 'number'); ?>
			</div>
			<h4><?php if ('open' == $post-> comment_status) { ?><a href="<?php the_permalink() ?>#comments"><?php comments_number('No Comments', '1 Comment', '% Comments'); ?></a><?php } ?></h4>
				
			<?php endwhile; endif; ?>

			<?php comments_template(); ?>

		</div>

		<?php get_sidebar(); ?>

	</div>

<?php get_footer(); ?>

PHP: