You can cancel your subscription directly from your Rythm account.
Log in and go to Account → Billing.
Select Manage Shipping and Payment.
Follow the steps to complete your cancellation.
Cancellation and refunds
Canceling your subscription does not automatically trigger a refund. If you’d like a refund for an existing order, you’ll need to request one separately. Eligibility depends on the status of your order and the applicable refund policy.
See Requesting a reversal of your latest charge or Returns, refunds, and the money-back guarantee for more information.