Use the worksheets for the estimated tax payment Form 1040-ES - https://www.irs.gov/pub/irs-pdf/f1040es.pdf
Also, go to this IRS website for estimated taxes information - https://www.irs.gov/businesses/small-businesses-self-employed/estimated-taxes
Payment can be made by mailing the Form 1040-ES and a check to the IRS.
Or you can use the IRS payment website for Direct Pay - https://www.irs.gov/payments
