Yes she might not know the feeling just yet, but just make sure she knows that pee and poop go in the toilet.

Make sure you give her a lot praise when does go poop in the potty.

Children love the approval from their parents.

If you have anymore questions for me or would like to reply back to this comment.

When he does pee or poop on himself let him help you clean it up.

Another thing get him some tinkle targets so he can have something to aim at or a weeman urinal where he might just enjoy peeing in.