You can delete the form and redo it.
Here
are the steps for deleting unwanted forms in TurboTax Online:
Open
your return in TurboTax. (To do this, sign in to TurboTax, and select the Take me to my return button.)
In the
left side bar, select Tax Tools> Tools.
In the pop-up window
Tool Center, choose Delete a form.
Select Delete next to the form/schedule/worksheet and
follow the onscreen instructions.