First, read through your judgment and find out how much money you owe and to whom you owe it.
Collect the needed funds, either through your current paycheck or by taking on extra work to be able to afford the payment.
If you were unaware of the judgment, you can file a motion to vacate the judgment for improper service if you never received the summons to appear in court. Remember, you will have to file this with the court that processed the judgment.
Contact the debtor, and find out their process for payment.
Once the payment is made, make sure to report it to the court to show the judgment as paid in full. You will need to prove the payment through a receipt and fill out a request to vacate judgment form.