How do you go back and manually clear when you have already registerd?

[KrisD]

I think this is what you want to do.

Clear and Start Over.

1. If you haven't already done so, sign in to your TurboTax account and select the Take me to my return button.
2. On the welcome back screen, in the left-side menu, select Tax Tools (you may need to scroll down to see this), and then Clear & Start Over (select the menu icon in the upper-left corner if you don't see this menu).
3. Answer Yes in the pop-up to confirm.