Adding StumbleUpon button to ending of each Blogger posts

The same trick as this post, we have to customize Blogger template!

1. Goto "Layout/Edit HTML", and check "Expand Widget Templates"
2. Find HTML tag at section:
   
   "<div class='post-footer-line post-footer-line-3'></div>"
   
   
3. Insert in that "div" enclosure the StumbleUpon code:
   
   <a expr:href='"http://www.stumbleupon.com/submit&#63;url=" + data:post.url + "&amp;title=" + data:post.title'><img src="http://www.stumbleupon.com/images/su_micro.gif" alt="StumbleUpon"/></a>
   
   Note: the spaces around the "+"s (the plus character) are essential! And the Logo of StumbleUpon can be changed on your preference.
   
   
4. Save the template.
   

Reference:
StumbleUpon and your Blog