Google AdSense is a Google app, through which website publishers in the Google Network of content sites serve text, images, video, or interactive media advertisements that are targeted to the site content and audience.
Make sure to connect your website to Google AdSense to be able to show ads directly on your Blog Pages.
To show ads on your blog:
In the Website Editor, click Pages.
Find the Blog page and click the Edit button.
Click the Settings tab.
Enable Adsense Advertising and fill in the details:
Enter your Google AdSense - script snippet code
Enter your specif Google AdSense - responsive ad script code
Set the Ad Location (top or bottom of the post)