Within TurboTax, on the Deductions & Credits tab at the top of the screen, select the EDIT/Add button for Mortgage Interest, Refinancing, and Insurance. The next screen should be a Mortgage Deduction Summary. On that screen, next to the Mortgage lender that has been created, there should be an image of a Trash Can. Select the trash can to delete that lender file from your tax return.
A sample screenshot identifying the Trash Can is attached.