As long as you haven't yet e-filed your return, you're good. You can clear all of the information you've entered, or you can simply abandon the return. If you'd like to clear all of your data, use the "Clear and Start Over" feature (as long as you haven't made a purchase or registered your product). Instructions are included below.
https://ttlc.intuit.com/replies/4248526
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***