If you want to send in a paper check print out the 1040 voucher https://www.irs.gov/pub/irs-pdf/f1040v.pdf
If you want to do the same thing electronically use https://www.irs.gov/payments and make sure you indicate it is for the tax year 2017
Disclaimer: Not a tax professional. Information gathered from internet links. Anything dated in June 2019 was posted in prior years and is before the 2019 limits and changes.
