First, be sure I understand your question correctly.
Have you finished a TurboTax return, but have NOT actually filed it at all? i.e., you have not printed and mailed it, and you have not efiled it?
If that's the case, and you haven't mailed or efiled, then your return has not been filed. You are not obligated to file it with TurboTax if you don't wish to.
If you haven't paid or registered you can clear it out if you wish. But it won't let you clear it if you paid or registered. Here's how:
https://ttlc.intuit.com/questions/2586254-how-do-i-clear-and-start-over-in-turbotax-online
