If you want to terminate your DNS manager, please select DNS manager from the Service list, then you will see your DNS manager service:
Then click on Request Cancellation:
After that, you need to select a reason why you want to cancel the service and select cancellation type.
Then you can click on Request Cancellation.
Please keep in mind that if you terminate your DNS manager, all records will be deleted. We will not be able to recover them, unfortunately.