Digg Icon on the Side of the post

Login into Blogger.com

Click the Layout > Edit Html > Check In Expand Widget Templates

Find out the Line

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

Copy and Paste these codes below the line which you found

<div style='float:right; margin-left:10px;'>
<script type='text/javascript'>
digg_url = '<data:post.url/>';
digg_window = 'new';
</script>
<script src='http://digg.com/tools/diggthis.js' type='text/javascript'/>
</div>


You can see here in this blog - How the Icon Appears in the post - Check out the Top right of the post.