Uh oh, that could be a compound fracture if the bone pierced the skin. Does it look like it came through the skin? Do you have Betadine or Chlorhexidene for disinfecting the wound? The bone needs to be straightened befroe splinting. I have never set a bone in my own chicken before, so I would try to get it straight with some traction on the joint and the foot, then one persone hold the leg while the other splints it. If you could clean off the area tonight and see a vet in the morning, that might be easier. So sorry this happened.