Have you already paid for the online edition you are using?

Have you already filed your tax return or registered the Free edition?

If not, then you can clear your return and start over. 

Click on Tax Tools on the left side of the program screen while working on the 2017 online tax return.  Click on Clear & Start Over.

I already paid!

Unfortunately if you already paid or registered you are unable to clear and start over. Click here to read more: https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-clear-and-start-over-in-turbotax-onli...