Also, try placing his food where he is pooping. The spray, referenced above is called Feliway, and though I haven't used it, I have heard good things about it. If things don't get better, try purchasing or borrowing a large dog crate. Start training all over again- keep the kitten in there until you know things are good and learned. You can take him out for play time, etc., but keep him confined until he learns. Also remember that he keeps smelling the scent and coming back to the spot. He may not care for the litter you are using...and sometimes switching litter back and forth will send a cat out of the box. I have six cats and four large boxes that I clean AT LEAST ONCE A DAY. Some cats are more finicky than others about the box. Good luck.