My advice is this:use a favorie candy or snack for efforts at the potty.
For instance M&M's worked for our son.Put a bowl of them on the back of
the toilet and enforce that the only way he gets "that" candy is for
effort to poop or pee in the potty.By the way,our son didn't potty train
until a week before I had our daughter and still had accidents for a
year afterwards.He was 3 and a half when she was born.