If you have not paid for the online edition you are using, have not filed your tax return or registered the Free edition, 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 2019 online tax return. Click on Clear & Start Over.
No. No one can access your tax return or your account. Did you already e-file, or did you just start a return that you need to clear and start over on?
CLEAR AND START OVER
BUT If you already e-filed, the answer you need is very different. Post back if you e-filed it.