L.P.
Hi -- this is what we did with my son, when he was almost 3. He, too, would NOT poop in the potty, although he peed with no problem. Firstly, we watched him. When he got quiet and went to the corner where he liked to do his business, we would ask him to go to the toilet. If he refused (which, of course, he did), we would tell him that he'd have to put on a pull-up then. No big deal -- his choice, pull-up or potty. In this beginning stage, we had our fair number of not-so-nice messes in the underwear, and he was pooping every few days as opposed to daily. At the same time, we encouraged him to go to use the toilet in every way I'm sure you already do (books, talking about it his friends who were already potty-trained, etc). I even let him in with me while I was busy in there. This wasn't making big headway, but, at least he was familiar with it. Then, we introduced a dual-edged bribery thing. We went to the candy store and he picked the colors for a bag of M&Ms. These were his "poop in the potty" M&Ms. I put the M&Ms in a jar, put it up high in the bathroom, and, the deal was, every single time he pooped in the potty, he got a handful of M&Ms. Secondly, we picked out a big gift (in our case, a big Bruder gargage truck), showed him the pic on the internet, and told him that he could have it if he got 10 stickers for 10 times of going poop on the potty. We made a sticker chart together (long and brown, like poop. He liked the yuck factor). I won't lie to you, he was still reluctant, but the M&Ms and truck were very alluring. We still had to coax him 6 times, and had a little dance party every time (with M&Ms). After the 6th sticker, he finally seemed fine. We ordered the truck, and by the 10th time, he was fully potty-trained and wanted his truck! We've never had any problems since. Ever. We finished up the jar of M&Ms about 3 months ago, and that was that. Good luck!