Form 2210 is on turbo tax is not letting me correct a problem w line d withholding

Where are you trying to enter information?   In the interview or directly on a form?   You should be able to enter information in Part ll, Line D of Form 2210.   Which form are you working with?  

The IRS levies underpayment penalties if you don't withhold or pay enough tax on income received during each quarter. Even if you paid your tax bill in full by the April deadline or are getting a refund, you may still get an underpayment penalty.

To possibly reduce or eliminate your underpayment penalty, open your return in TurboTax and search for annualizing your tax (use this exact phrase).  This will take you to the underpayment penalty section, and we'll take you through the steps to possibly reduce what you owe.