1.Login to your blogger dashboard--> layout- -> Edit HTML

2.Click on "Expand Widget Templates"

3.Scroll down to where you see below code:

<div class='post-header-line-1'/>

4.Now Copy your Retweet Counter Button code and paste it just below the above code.

NOTE: If you can't find <div class='post-header-line-1'/> in your template paste your Retweet Counter Button code just before <data:post.body/> .

CODE 1:

<div style='float:right; margin-left:10px;'>
<script src='http://www.retweet.com/static/retweets.js' type='text/javascript'/>
</div>

Result:

CODE 2:

<div style='float:right; margin-left:10px;'>
<script type="text/javascript">
size = 'small';
</script>
<script type="text/javascript" src="http://www.retweet.com/static/retweets.js"></script>
</div>

Result:

You are done.