You have not said whether you need to pay federal or state tax.
If you need to pay federal tax to the IRS you can mail in a check or money order with a Form 1040V voucher, or you can pay on the IRS site:
https://www.irs.gov/payments
If you owe state tax, you can pay the state by check or money order or go on the state's tax web site.
https://ttlc.intuit.com/questions/1901670-how-do-i-contact-my-state-department-of-revenue
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