First of all you should know how to show adsense ads in between the posts.
For that You will have to follow the steps below :
Step 1: Sign in to your adsense account and get the adense code.
Now, you have to parse the code using online parser. Paste your adsense code here and you will get the parsed code.
Step 2 : Sign in to your blogger account and from Template panel go to Edit-HTML. Expand HTML and then put your adsense code in the following format.
Example is given here :

<b:if cond=’data:blog.pageType == “item”‘>
<center><div>

Your Parsed Adsense code here

</div></center>
</b:if>

For Wordpress users : I will prefer a plugin “Shylock Adsense” using which you can have adsense ads of different sizes, type on selected posts. You can fully customize your ads’ looks, it’s placement and much more.