1. Click the “Home” tab after logging in to AdSense, and then click “Account Settings” on the left side of the page.
2. Scroll down to the “Access and Authorization” section, and click the “Only allow certain sites to show ads for my account” check box. A new text field appears.
3. Enter each domain that you want to allow for AdSense in the “Authorized Sites” field.
4. Click the “Save” button.