You can cancel a license only in case if it is not in use (server under this license was not registered or was deleted). The license is not active and can be canceled as long as the servers are not added.
1. To cancel CloudLinux or KernelCare license click Remove unused license.
2. If you need to cancel an active license, you have to remove servers first.
Go to Servers tab, mark proper checkbox in front of a server (or several) you want to remove and click Remove servers.
Then go back to step 1 and remove the license as unused.
Note. You will still be paying for a license after removing servers until you remove the unused license.