If you don't want to use NaturalReader anymore and have an active subscription, cancel it first before deleting your account. Deleting your user account will not cancel your plan.
To delete your NaturalReader account:
While logged into AI Voice Generator, and select Accounts from the app menu
Select Edit
Select Delete My Account
If you are sure you want to proceed with the deletion, select Delete My Account to confirm
Your account will be deleted and all relevant data removed