At your profile page, you will see this upon login. That is where you can manage your payment & subscription details.
Enter your email, you will get a OTP to login to manage your payment details.
Upon login, you can cancel your subscription, change your card details, or reactivate your subscription.
If you need help, feel free to drop me a message via webchat or email me at James@sensualsingapore.com, i can do the cancellation on my end too.