1.Sign in to your AdSense account
2.In the left navigation panel , click "Settings"
3.In the "Account information" section, click Cancel account.
4.review the information on the Account Cancellation page .
You will receive the cancellation message on your e-mail. Click on the link inside the e-mail to complete the cancellation process .
On the “Account cancellation” page, a message is displayed telling you that your account has been successfully cancelled. Any remaining account Administrators will be notified that the AdSense account associated with their Google Account has been cancelled.