A most curious question indeed. Most people file for bankruptcy protection precisely because they don't have money laying around to pay their debts.
If you got a discharge, your obligation to pay debt that was discharged has been wiped out. But consult with your attorney. There must have been some identifying information about the debt in your bankruptcy schedules. Then track the business down, and mail them a check. I must be missing something here.
Why? The debt was discharged so no obligation to pay the debt. If you choose too make voluntary payments, just send them a check, but since they will have written off the debt they will likely not know what to do with your payment.
I believe that this would be a very bad thing to attempt. You may have the best of intentions but if you acknowledge the debt post discharge and complete certain other steps, you may re-establish legal responsibility for the debt and be subject to financial liability and potential suit.
A job? Sending them money? How could we know how you would do it? No, voluntary payments do not make you liable again (in fact, that is contrary to the law) so pay whoever you want as much as you want.
We need more facts. Why did you file bankruptcy in the first place if you want to pay the debt back? The bankruptcy should of discharged the debt. I suggest you consult with your bankruptcy attorney on this matter.