Adding Facebook Share and Like buttons to your blog is not as difficult as you have often thought. I know you might have seen it on this blog on the right-hand side and wondered how on earth I added. It is so simple to do that. I will briefly teach you how to do that here
All you need to do is open your blog.

    * Then go to Design >> Page Elements
    * Then Click Add Gadgets
    * A new window will open and you will see various gadgets that you can add to your blog
    * Scroll down to find "HTML/Javascript"
    * Select it
    * Copy the code below and paste it in the Content Box

<!-- floating page sharers Start Share This With Friends-->
<style>
#pageshare {position:fixed; bottom:15%; left:10px; float:left; border-radius:5px;-moz-border-radius:5px;-webkit-border-radius:5px;background-color:#fff;padding:0 0 2px
0;z-index:10;}
#pageshare .sbutton {float:left;clear:both;margin:5px 5px 0 5px;}
.fb_share_count_top {width:48px !important;}
.fb_share_count_top, .fb_share_count_inner {-moz-border-radius:3px;-webkit-border-radius:3px;}
.FBConnectButton_Small, .FBConnectButton_RTL_Small {width:49px !important; -moz-border-radius:3px;-webkit-border-radius:3px;}
.FBConnectButton_Small .FBConnectButton_Text {padding:2px 2px 3px !important;-moz-border-radius:3px;-webkit-border-radius:3px;font-size:8px;}
</style>
<div id='pageshare' title="Share This With Your Friends">
<div class='sbutton' id='fb'>
<a name="fb_share" type="box_count" href="http://www.facebook.com/sharer.php">Share</a><script src="http://static.ak.fbcdn.net/connect.php/js/FB.Share"
type="text/javascript"></script>
</div>
<div class='sbutton' id='rt'>
<a href="http://twitter.com/share" class="twitter-share-button" data-count="vertical" >Tweet</a>
<script src='http://platform.twitter.com/widgets.js' type="text/javascript"></script>
</div>
<div class='sbutton' id='su'>
<script src="http://www.stumbleupon.com/hostedbadge.php?s=5"></script>
</div>
<div class='sbutton' id='digg' style='margin-left:3px;width:48px'>
<script src='http://widgets.digg.com/buttons.js' type='text/javascript'></script>
<a class="DiggThisButton DiggMedium"></a>
</div>
<div class='sbutton' id='gb'>
<script src="http://connect.facebook.net/en_US/all.js#xfbml=1"></script>
<fb:like layout="box_count" show_faces="false" font=""></fb:like></div>
<div style="clear: both;font-size: 9px;text-align:center;"><a href="http://naijacomputerzone.blogspot.com/2011/06/how-to-add-facebook-share-and-like.html">Get this</a></div>
</div>
<!-- floating page sharers End -->

    * Save your blog
    * View your blog

I hope I have helped you.