The question you referred to wants to know how much you paid the IRS for federal taxes owed at the time, if any, if you filed an extension for your 2017 tax returns.
In others words, if you knew you were unable to file by April 17, 2018 but thought you would owe taxes when you were able to file your 2017 federal tax returns, then you would include payment along with the extension and then enter the amount on the screen you referred to in order to get credit for taxes paid and reduce your taxes owed.
I'm uncertain if you are confusing this with installment agreement payments. If so, installment agreement payments should not be included to reduce your taxes owed because they are themselves taxes owed but for a different period of time.
