How to Add Adsense Ads After First Post?


I want to add a adsense ads after first post on label, archive, etc page but its not working.

I have tried a method as below. Adding below code after<b:include data='post' name='post'/>

<b:if cond='data:post.isFirstPost'>
<div align="center" style="margin:10px auto;">
Here goes the code of the element you want to show

but it didnot work for me.

By blog url :


Any one here for solution ? I am not able to add adsense ads after first post using above code.