If you already e-filed, it is too late to cancel anything.
If you have not e-filed, you can clear out the data you entered, and/or just abandon the account.
If you have not registered, paid or e-filed you can clear the return.
CLEAR AND START OVER
https://ttlc.intuit.com/questions/2586254-how-do-i-clear-and-start-over
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**