The easiest way to cancel a subscription plan from a user is by removing them from the product within Learnworld, according to this article.
Nevertheless, you can also cancel a user's subscription plan from within Stripe with the following steps:
1. Navigate to the Billing Tab in your Stripe Dashboard.
2. Click on Subscriptions.
3. Navigate to your user, hover on the three dots, and click Cancel Subscription.
On the emerging popup, you can either:
a. Cancel the subscription Immediately.
b. Cancel the subscription when the current billing cycle ends.
c. Cancel on a custom date.
Note: You can Offer a refund if needed.