After reading an article by Woork, I added Tweet this to my bloggers. The article was simple but I thought I could add a little bit more details here.
Open your blogger and go to Layout.
Click Edit HTML then tick a box next to Expand Widget Templates.
Then find a line
<div class="post-footer-line post-footer-line-1">
Then after this line add the following line.
<div class="tweetmeme">
<script type="text/javascript">
tweetmeme_url = '<data:post.url/>';
</script>
<script src="http://tweetmeme.com/i/scripts/button.js" type="text/javascript"> </script>
</div>
Then add CSS just before the line.
]]></b:skin>
I add the following css to mine.
tweetmeme {
width: 70px;
height: 75px;
float: left;
}
For your normal website, you can use the following code where you want to add Tweetmeme.
<script type="text/javascript" src="http://tweetmeme.com/i/scripts/button.js"></script>
You can find an Official documentation.