Hey there Rae Rae,
To delete the account, you will need to simply revoke your phone number and the account will no longer be able to send or receive messages and calls.
If you need help releasing your phone number, please check out our guide on how to do that here:
We would also suggest that you remove the email address and change the password within the Profile settings of your TextNow app, as that way it cannot be reactivated. Then, sign out of the app and remove it from your device.
We hope to see you come back soon either to enjoy our free service, or to take advantage of our wireless plans, listed on textnow.com/wireless.