TurboTax does not support entering a tax payment on Schedule 5 line 74 with box d checked. There is no way to enter it, either in the interview or in forms mode.
Overrides can be dangerous. An override can break the automatic calculations in unexpected ways. If you decide to file by mail with the override, check your entire tax return thoroughly to make sure that the override has not caused any errors elsewhere in the return, and that it does not change anything that should not have been changed. I would suggest printing copies of your return with and without the override, and comparing every form line by line.
