How to add adsense ads into blog post

First of all go to the Template and click edit.

Find "" and Click Expand

Then find" and expand it too.

Below this find

"" with option to expand. Click to expand.

Below find "

" and add adsense code above this to insert Ads at the top of the post. 

Encoding of the Adsense Ads

Using http://htmlentities.net