You use one Google AdSense account for all your iWeb sites. If you already have a Google AdSense account, you can use iWeb to change your account or create a new one.
Choose FileĀ > Set Up Google AdSense.
Click the Change Account button.
Click the Create New Account button.
Type the email address that you want to associate with your new account.
Click Submit.
When you receive confirmation from Google, complete the registration process for your new account.