As long as you haven't paid yet or registered your return, you can use the Clear & Start Over feature. Take a look at the steps in the FAQ below. https://ttlc.intuit.com/replies/4248526
If you already registered but haven't submitted your return yet and you still want to start over, you can create another user ID. Just follow the instructions below. https://ttlc.intuit.com/replies/3288574
