Following are the steps to convert the default Adsense code into blogger compatible.
1. Go to Google Adsense and copy the ad code in 300*250 or 468*60 ad size or any unit sizes.
2. Paste your ad code into ad code converter below and click on Convert button.
3. It will convert your ad code.
Now the parsed code is ready to put Adsense ad below post title in blogger, just copy the converted highlighted ad code.