M.Z.
My son didn't "get it" about pooping in the potty for almost 6 months. A friend recommended that I have his favorite animal (his dog) poop in the potty. So, I held doggie over the potty and made grunting noises and then secretly dropped raisins in the potty! LOL The look on his face was priceless! I rewarded doggie with M&Ms. It took 2-3 of these "doggie" poopies before he did it too. It was more that he didn't understand it than he refused to do it. Good luck@!
Mel