The last two FAQs specifically address your question. One is canceling your subscription, and the other is closing your account. Let me know if you have any questions.
Hi, If you log into your Blomp Dashboard, click on "Settings" in the top right of the page, Choose "Profile" and the towards the centre of the page there should be an "Options" drop dow, choose this then "Close Account". This should close the account from Blomps side, to be safe you could also log into your PayPal and cancel the monthly payment.