Subscriptions can be managed by logging into your account here: https://probiorahealth.com/my-account/. If you are already logged in, you just need to click on my account in the top right to access your account.
From here you can select "Subscriptions" which you will find on the left-hand side. Once you are in, find the subscription you want to manage and click "View".
After you click "View" you'll be able to click the button that says "Cancel" should you wish to do so.