Unfortunately, canceling your subscription directly is not supported. However, by turning off the automatic renewal, you can stop it from renewing. The option to disable auto-renewal is available up to 14 days prior to the renewal date for monthly licenses and 30 days for yearly licenses. You can do so via your Chaos account. After disabling the automatic renewal, your subscription will be automatically cancelled when it reaches the end date.
Here is how you can turn off the automatic renewal:
1. Go to my.chaos.com
2. Go to Products > Active products
3. Click on the product of your choice
4. On the right side of the subscription details locate Disable auto renewal and click it.