1.Generate Parsed code for adsense code because we cannot put adsense code directly in the xml.So parse it using Adsense Code Converter.
2.After parsing,your ad code Should look like this.
log in to your dashboard-->Template- -> Edit HTML
Click on "Expand Widget Template" and scroll down to where you see this:-
<div class='post-header-line-1'/>
To place ad above your post header. Paste the code above this line.
To place ad below your post header. Paste the code below this line.
How To Place ad end of your post body
log in to your dashboard--> Template- -> Edit HTML
Click on "Expand Widget Template" and scroll down to where you see this:-
<p><data:post.body/></p>
Paste the code below this line, to show your ad at the end of your post.
NOTE : To Set the Align of your ad , Insert your code like this.
<p align="center"> Your Ad code </p>
Replace "center" with "left" or "right" for desired alignment.