TurboTax does not allow partial payments for taxes owed. What you can do is choose to pay your taxes owed by check, that will get you through to e-file your return. Then you can go to the IRS website & pay online.
https://www.irs.gov/payments
Please note that any taxes due needed to be paid by July 15th to avoid any penalty & interest. Penalty & interest will accumulate until the taxes are paid in full.
