TurboTax does not support the 1040-NR.
Please go to Sprintax to do your 1040-NR return (they are a partner of TurboTax).
If you have done that and are asking only how to pay the 1040-NR, when you go to the Payments page at the IRS website, and choose the 1040 option. Your account is saved by your name and ITIN in any case, so the payment should end up in the right place.
If this is worrisome, then use the 1040-V that should have printed with your return, write a check, and mail it in.
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