My son has ADHD n autism to he nine now but I can tell u he was a late potty trainer x they boys take longer to potty train he had accidents in his first year at school even . Have a few pottys I bought a couple then eventually found one he liked to sit on . Have a potty in his room aswell if that's where he tends to go. Use rewards, stickers are good. Lots and lots of praise even for just sitting on it and doing nothing take little steps .