Ok so my sister is 2 years and 5 month old. My parents recently baught her a children’s potty to help potty train her. But before they bought it for her we would put her on the regular toilet to pee or poop. So we got her the children’s potty so she can learn to pee and poop on her own without someone taking her to the bath room. she won’t use it she refuse to sit on it to pee. How can we get her to do her business using the children’s potty and forget about using the regular toilet?



She got used to the big potty so you should have just gotten her a stool instead and a seat cover to go on the big potty. That would have been a lot easier because the child potty is just that and she does not see it as a place to do her business.
If you are adamant about having her use the child one then get a reward chart and stickers. Every time she uses the potty on her own she gets a sticker. My grandma would reward with an M&M when my brother stayed at her house.
Or if there is something she likes get her an accessory to it.
Example: my brother loved hot wheels cars. Every time he went pee on his own he got a car. The first time he went poop he got a hot wheels case to keep his cars in.
However the above methods will apply if you just let her use the big potty too. I have never known any little kids that used those toilets, they always just got a potty seat for the big potty and that actually made them want to use it, along with the flushing of course.
get a special chart so everytime she goes potty she can put a sticker on it you can make one or buy one but every time she goes she puts a sticker on and can get a prize it doesnt have to be a big prize maybe like a couple mnm’s or at the end of the week she can get a bigger prize but make it fun
Use prizes for every time she goes potty by herself. Use things like mini mms, little packs of play dough, etc.