You can't. Just make the account inactive.
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Cancel My AccountTo cancel your AddictingGames account at any time, follow the steps below:Go to the My Account pageAt the bottom of the page, click the link "Click here to cancel your AddictingGames account".Enter your passwordSelect "Yes, I want to cancel my account"*Note: When you cancel your account, you permanently lose your entire profile, photos, high scores, favorite games, and all your friends on AddictingGames. Your login and password will no longer work on the site. If you change your mind, you may re-register with the same email account, but you will have to create your profile from scratch.(I found it in the help screen. I nearly missed it.)
To cancel membership when you are signed in to your account scroll to the bottom of the page, choose the My Account link, and from here you'll be able to cancel your membership.
log in and go on "my account" then you will see a opition to change your plan. then click on it and cancel plan
through your paypal account.