C.D.
What worked with my son was this: To get him interested in going at all, I kept a magazine rack next to his potty seat filled with baby books about OTHER kids going potty. I only gave him treats the first couple of times he went, but until he went without being reminded, I always made a big deal about him going. Then later, the first couple of times he pooped in the potty, he got treats, after that I just praised him every time until he started going on his own. It worked really well.