As long as you haven't paid your TurboTax Online fee, or already filed the return, you can clear any data that you have entered (Fees paid through Refund Processing and pre-paid code also count as "paid.") 

Once you've paid or registered, we're required to store copies of your return. These are the same requirements imposed on accountants, CPAs, and other professional tax preparers.

You can follow the instructions listed in this TurboTax FAQ to clear  your return:

https://ttlc.intuit.com/replies/3300662