Potty Training help please

Ni

I haven't been on here in a while! Im hoping for some advice please for my almost 3 year old boy with potty training!

He does really well with the potty if he doesn't have a nappy or underwear on he will run to the potty and do what he needs to do, but as soon as I put underwear on him he will do his business in them! I keep telling him no no and he will repeat it after me but he still goes in them.

I do try to take him as much as I can to the potty and remind him about "not in underwear and go to potty " **he knows how to pull his underwear down**.

I Also I have a boy and he can't keep his hand off his you know what so I need to put undies on him! 🙈

**I put underwear on him and took him to the potty this morning 3 times and he did his business, I kept asking him if he needed to go and took him he says **NOOOO** 😩...then a few mins later I can smell it !!! I look in his undies there it is a big poo!!! **

Any advice for help with not going in underwear ☺️ 🙏

I hope this makes sense!

Thankyou in advance x

UPDATE:

So I filled this with lollies and he got to pick 1 everytime he went to the potty.. only problem is he was having almost 8 lollies a day, 😭..so I have had to distract him and give him a sticker now and give him a lolly when he does a poop !! And it is working an idea for anyone who may need a bit of help :)