How do I cancel my subscription?

Hey,
I suddenly got an e-mail saying I was charged $49 for a sub I forgot I had and I can't find anywhere, where to cancel the next payment.

Thank you

Hello Dina.
We acknowledge your request to cancel the automatic renewal to avoid next charge.
However, you do not have an active subscription registered to the email address that you used to contact us here.
I have sent an email requesting more details to locate this charge to assist you further. Please revert it containing those details.