The Google Adsense team has been working behind to scenes to give publishers better control on their sites. Your single Adsense account can be used to display your ads across several websites. This is an excellent feature since you don’t need to manage multiple accounts for multiple sites.
In the new feature released, you have much better control via the “Site Management” section. While this feature is being rolled out to users globally, other users can still authorize which sites they want to display ads and earn revenue from.
To add and claim which sites you wish to show ads on, navigate to your Account Settings and scroll right down to the bottom to the section “Access and authorization”
Hit the Edit link at the end of “Sites authorized to show ads” and you’ll see a box like this where you can enter your domains you wish to authorise.
You can enter your domains above on which you wish you display ads.
Note: If you don’t add a site to the authorized sites list, and you place your ad code on it, ads will continue to appear on the site but you won’t earn from them. Therefore, please enable this feature with caution to avoid missing out on valid revenue.