Have you filed your return yet? Was it accepted? If you already filed your return, did you enter any information about paying taxes owed?
If you already filed your Federal return and it has been accepted, then you can pay your taxes owed on the IRS website
https://www.irs.gov/payments
Or, you can mail in a check with a payment voucher (1040-V)
https://www.irs.gov/pub/irs-pdf/f1040v.pdf
If you have not filed your return yet, when you go through the File section near the end, it will ask how you want to pay taxes owed, you can choose by check, direct debit, or credit card.
