need to print current row position number in block for most popular article
You can do this in two steps below,
STEP : 1
Add the views result counter under the fields option
Ex:
Fields
Global: View result counter
Content: Title
Content: Body

STEP : 2
If you want to theme it in your own way add the following tpl.php file in your theme folder,
views-view-field--custom-view-theming--counter.tpl.php
I have added the following html to theme it like a tab
&lt;span style=&quot;margin-bottom: 20px;padding: 5px;border-radius: 3px;background: #479ED2;color:#fff;&quot;&gt;
    View result counter:&lt;?php print $output; ?&gt;
&lt;/span&gt;

Thats all about bringing a view counter in your block.