There are 2 ways to add Adsense to Blogger blog- one is manually add the Adsense codes, another is use the Blogger's built-in feature to add ads without touching the codes.
Add Adsense codes manually is the most powerful way- it gives you the flexibility to add the ads to anywhere on blog- in the sidebar, inside post in any location and outside post anywhere.
Before adding Adsense codes, make sure your Adsense application has been approved by Google. Check my previous post for details on "How to Get Adsense Application Approved by Google ? "
Manually Add the Adsense Codes
To add Adsense codes manually:
1. Login to your Adsense account, create a new ad with the proper size and color you want, then generate the ad codes. Copy down the codes.
2. Important ! Prepare the Adsense codes for Blogger. You have to do this before adding the Adsense codes to template.
Copy the ready-to-go codes in the box.
You can then drag that gadget to different location in the side bar, or drag to above the Blog Post, under the Blog Post- so the ads can be showing in anywhere you want. See above screenshot for the different locations.
Make sure to click on Save button at the top-right corner after you adjusting the position.
4. If you'd like to add ads inside every single post at the some position, you can start from the dashboard, go to Template->Edit HTML, to add the Adsense codes directly in to the template.
Note: this requires you know where to add the codes in the template. I will discuss the details later.
Another way to add Adsense ads
Also, you can use Blogger's built-in feature to add ads on blog without touching the codes. The only limit for this way is, you can't add ads to inside the post. Other than that, it's easy and convenient.