Not sure where you are in the process or what you need to change but
estimated payments https://ttlc.intuit.com/community/tax-payments/help/where-do-i-enter-my-estimated-tax-payments/00/25...
If you want to change withholding amounts next year you need to do that with your employer by changing your W-4 https://turbotax.intuit.com/tax-tips/irs-tax-forms/what-is-a-w-4-form/L2NapDzX2
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.
