Instructions to set up electronic payment with an e-filed amended federal return

I tried to set up electronic payment with an amended federal e-file tax return.  I marked the Yes box on the third option in section IX which says, "Use Electronic Funds Withdrawal of Amended Federal Balance Due".  I entered the date and amount for withdrawal in the Amended Return section.  I did not enter a date or amount in the payment section above, which is for original tax returns.  When I look at the client letter, there is no indication that the funds will be electronically paid.  Is the letter only meant for original returns? If I also enter payment information in the original return section, will the amount due be paid twice?  Who knows because the ProSeries "Expert" was unable to answer my question and couldn't get an answer from whoever she was corresponding with at ProSeries.  There are no instructions on how to set up electronic payments in the How to File an Amended Tax Return instructions.  I wasted almost an hour with two different "Experts" at ProSeries trying to find the answer.......what a great way to start my day.