That is an absurd solution.
Turns out if you sign up to their cloud account first, then subscribe to the addons through that you can manage and cancel that way. Unfortunately, when you try to access the panel for the first time it prompts you to sign up through the panel not through the cloud account, so there is no binding between the cloud account and the subscription if you do it that way which I regrettably have.
This is odd because it has managed to import all of my billing information into the account, but has failed to import the subscription.
There is a support ticket system in the cloud account, so I have submitted a request to cancel that way. I’ll give cyberpanel 24 hours to respond.