Note for this you need to encode your ad code or this wont work.
using this site you can encode your ad code Click here to Encode
Log in to your blog account then goto dashboard
Then click on “Template” in the side menu then “Edit html”
Use CTRL + F to find this code “<b:includable id=’post’ var=’post’>”
If you need to add Ad before the Topic
scroll little bit down and find the code “<div class=’post-header-line-1′/>” then paste bellow code before the “<div class=’post-header-line-1′/>” line
<b:if cond=’data:blog.pageType != "index"’>
<!--Encoded ad code here-->
</b:if>
If you need to add Ad after the Topic
scroll little bit down and find the code “<div class=’post-header-line-1′/>” then paste bellow code after the “<div class=’post-header-line-1′/>” line
<b:if cond=’data:blog.pageType != "index"’>
<!--Encoded ad code here-->
</b:if>
If you need to add Ad inside your article content
Scroll down and find the following code “<data:post.body/>” then paste the ad code right above the line “<data:post.body/>”
<b:if cond=’data:blog.pageType != "index"’>
<!--Encoded ad code here-->
</b:if>
the conditional tag will make the ad only shows on post pages. If you want the ad to show on all other pages pages, just remove the condition lines.
That’s it save your blog and enjoy..