Well there are a few ways. One is to see where they go in the cage most. You can then place a few smaller pans in those areas. If they still use them, then you can slowly start taking them away until they just use one. Another way is to just use bedding in that part of the cage and use fresh poops to put in the bedding so they know there marked territory and go there. I tried several pans at first and that didn't work. I then started using the bedding in one main pen with the fresh poops which started working. Pretty much 90% of the time now my three go there though a few show up near the hay and food area.