How to potty train?

my son is autistic with adhd and he will be 4 next month and ive tryed diff ways to potty train him he will not go he actually told me loud and clear he will not go potty in the toliet lol i tryed not to laugh but i did and i told him hes a big boy now he needs to go to the toliet ive tryed rewards ive tryed diff pottys ive tryed everything literally!!! im at wits end and he is in school to idk what to do anymore…

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