First of all you need to download the buttons, so you can do that here.

Download Social Media Icons

You need to upzip that into your images folder, so that the path to them goes something like, “theme/images/(put ‘social-media’ folder here)/”

Then, in your entry.php and your single.php files, add the following code right under the “<?php the_content() ?>”:

<!-- social bookmarking buttons! -->
<div class="social-media">
<a rel="nofollow" href="http://digg.com/submit?phase=2&url=<?php the_permalink(); ?>" title="Submit this post to Digg"><img class="social-button" src="<?php bloginfo('template_directory'); ?>/images/social-media/digg.png" /></a>

<a rel="nofollow" href="http://twitter.com/home?status=<?php echo urlencode("Currently reading: "); ?><?php the_permalink(); ?>" title="Share this article with your Twitter followers"><img class="social-button" src="<?php bloginfo('template_directory'); ?>/images/social-media/twitter.png" /></a>

<a rel="nofollow" href="http://www.stumbleupon.com/submit?url=<?php the_permalink(); ?>&title=<?php echo urlencode(get_the_title($id)); ?>" title="Share this post at StumbleUpon"><img class="social-button" src="<?php bloginfo('template_directory'); ?>/images/social-media/stumble.png" /></a>

<a rel="nofollow" href="http://www.facebook.com/sharer.php?u=<?php the_permalink();?>&t=<?php echo urlencode(get_the_title($id)); ?>" title="Share this post on Facebook"><img class="social-button" src="<?php bloginfo('template_directory'); ?>/images/social-media/facebook.png" /></a>

<a rel="nofollow" href="http://reddit.com/submit?url=<?php the_permalink(); ?>&title=<?php echo urlencode(get_the_title($id)); ?>" title="Share this post on Reddit"><img class="social-button" src="<?php bloginfo('template_directory'); ?>/images/social-media/reddit.png" /></a>

<a rel="nofollow" href="http://delicious.com/post?url=<?php the_permalink(); ?>&title=<?php echo urlencode(get_the_title($id)); ?>" title="Bookmark this post at Delicious"><img class="social-button" src="<?php bloginfo('template_directory'); ?>/images/social-media/delicious.png" /></a>
</div>

I would also add some css:

.social-buttons {
padding-right:5px;
}

Of course, you can add more buttons if you would like – there are a ton of them in the folder I gave you. Enjoy! (Because let’s face it, social buttons look way better when you manually add them, compared with those awful bookmarking plugins!)