TurboTax cannot provide direct debit on a paper-filed tax return because the IRS doesn't allow it.
When TurboTax asks how you want to pay, select "I will mail a check." That doesn't really mean that you have to mail a check. You can then pay with Direct Pay at the link that SteamTrain posted. Your payment does not have to be sent together with your tax return.
It's not clear why you can't e-file. Living abroad does not automatically prevent e-filing.
