Payment is not required until you either e-file or print your return. You can simply abandon the return.
If you'd like to delete any data you've entered, you can use the Clear and Start Over feature. See instructions 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.***