Billing is handled by Stripe. You'll enter your email on their page, then they email you a code to sign in. From there you can update your card, see past invoices, or cancel.
No cancel option there?
That means the subscription is already canceled, so there is nothing left to cancel. Stripe only shows the button while a subscription is active. Your past invoices stay available on that same page. If you think that is wrong, email tthompson0808@gmail.com and Tyler will check the account directly.