You can make your payments online here:
https://www.irs.gov/paymentsBe sure to indicate that you're making estimated payments for tax year 2017.
Also see this:
https://ttlc.intuit.com/questions/2584228-can-turbotax-calculate-next-year-s-federal-estimated-taxes
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
