How To Insert AdSense Inside Post in Blogger?

Frstly, I will advice you to backup your  template before you proceed with the following steps I would outline immediately.
A. Steps (In Your Google Adsense Dashboard)
1.  Login to your Google Adsense account. 2. Navigate to your Dashboard, and Create an ad campaign. 2. Save and Generate your Code 4. Run your generated code through this program to get it parsed.

B. Steps (In Your Blogger Dashboard)

1. Navigate to Template > Edit HTML > Proceed (for old interface: Dashboard > Design > Edit HTML).
2. Tick the Expand Widget Templates check box on top right of the HTML window.
3. Search for the following line in your HTML code.
HINT: Click here to parse your Google Adsense code for blogger

<data:post.body/>

(To do so quickly, Hit CTR.F in your keyboard, a search bar will appear, insert the line of code above to quickly get it’s location).

4. Place the parsed AdSense code Directly Above the code you found.
5. Optional, Insert Adsense code between the code below before placing above the HTML code you found.

<b:if cond='data:blog.pageType == &quot;item&quot;'>
PLACE PARSED AD CODE HERE
</b:if>

The conditional tag in lines 1 and 3 will make the ad appear only on post pages. If you want the ad to appear on all pages, just remove the lines.

6. Save and view your blog.
That’s it, everything should work like a charm if you followed these steps correctly.

Note: You don’t need to worry about violating the AdSense ToS, which insist that you must not temper AdSense code. When you parse your AdSense code, you do not alter it in anyway, you only convert the code to the format that all blogger templates understands. If you are still in doubts, kind find more information here and here.

So hopefully this tutorial help you a lot..

Thank You!