You need to revisit the Underpayment penalties section in TurboTax, which is in the Other Tax Situations section. When you work through that section, you will be asked to enter your tax liability for the previous year. That is how you can change your previous year tax liability.
If you owed a penalty before you went through the underpayment penalty routine, then you would need the form 2210 to reduce or remove the penalty. Otherwise, you can delete the form 2210 as follows:
A simple way to delete forms in TurboTax online is to use the Tax Tools menu option, which is on your left menu bar when you are working in your program. Then, choose Tools and then Delete a form. Find form 2210 in the list and delete it.
If you are working in the download TurboTax program, use the Forms Mode on your menu bar to bring up the form you want to delete, then choose the Delete Form option at the bottom of the form.
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