Get your taxes done using TurboTax

It should be listed in Step 2 of the File section if you have federal taxes owed.

This is what I see on my test online return -

Or you can select pay by check and then e-file the tax return.  Do not mail a check after filing.  Go to this IRS website for a payment plan application - https://www.irs.gov/payments/online-payment-agreement-application