You can't, you have to call their customer service during office hours on 1800-NEWSDAY.
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To cancel your Newsday subscription from their website, you typically need to log in to your account, navigate to the subscription settings or account management section, and look for an option to cancel or deactivate your subscription. Follow the on-screen instructions to complete the cancellation process. If you encounter any issues, you may need to contact Newsday's customer support for assistance.