After he has done his duty, give him a treat immediately . Once he gets the general idea and starts using the litter pan in his cage, place a few litter pans throughout the room where he will play.
Ferrets have short attention spans, so the more litter pans, the better.
If the area smells more like a bedroom or a kitchen, your ferret is less likely to use it as a bathroom. First of all, know that your ferret probably isn't biting you out of anger or to hurt you. Ferrets have extremely tough skin and they play rough with each other. But if your new ferret bites you, then you have to begin nip-training immediately. Never put your ferret down when he bites you.