We don't know what "this" is. If you want to delete all the entries on your tax return, you can do that if you have not filed, registered or paid. Use this link: https://ttlc.intuit.com/questions/2586254-using-clear-start-over-in-turbotax-online
If you have decided you don't want to use TurboTax, you can just abandon your account and leave the information in it. Accounts cannot be deleted.
