If you have a subscription, cancel it first before deleting your account.
If you're not sure if you have a subscription, login through the NaturalReader web app and go to Account > Subscription & Billing > Refresh. If a subscription is active, select Cancel Subscription.
If you subscribed through Google Play or the App Store, the subscription must be cancelled from your mobile device's subscription settings.
Once your subscription is cancelled, you can delete your user account.
While logged into your user account, select Account from the side menu
Select Edit
Select Delete My Account
If you are sure you want to proceed with the deletion, select Delete My Account to confirm