I've recently added "digg button" and would like to share step-by-step guide with all bloggers who has blog in blospost. As you have noticed, many blogs and websites use this tool to maximize their traffic. So it's worth trying for you too.

Let's start:

STEP 1.
Sign in your dashboard and go: Settings=>Archiving, then find "Enable Post Pages" and verify or set it to "Yes". Otherwise, if it will be se to No, you will not be able to digg your posts, as each post must have a unique URL to be submitted by digg.

STEP 2.

Then go to Template=>Edit HTML. Now you need to add a special code for digg button inside HTML of the template. But first, save the template or download and backup, as you may need it if the changes you make to the template are wrong.

Now click the box “Expand Widget Templates", then click on F and CTRL buttons on your clipboard at the same and search for the code data:post.body.
Then place the following code just before the element "data:post.body":


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



The digg button wlll automatically appear at the top right corner of all your current and future posts.

If you'd like to add it on the top left corner, then put the following code just before: "data:post.body":


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



At last, save the change and review your updated blog.

Hope this will work for you, as did for me.
However, feel free to ask questions, if you have any.