To cancel a subscription purchased through Subscribe with Amazon, follow these steps: 1. Ensure that you are logged into the Amazon account associated with the subscription. 2. Find the subscription you want to cancel and click "Manage Subscription." 3. Look for the link under "Advance Controls" and click on it to go to the main subscription page. 4. On the main subscription page, you can terminate your subscription. 5. If you have questions or need further assistance with subscriptions billed through Amazon, you can visit their customer support centre.