My son is non verbal and has recently started to say go to the toilet when we are out and about. When we began toilet training we used to take him every 20 minutes until he started to recognise what we were trying to do. We used the same words when asking him if he wanted to go and he takes himself to the toilet when we are in the house when he needs. We stopped putting him in nappies when we went out when he started school. We took him to the toilet before he left the house, if he didn't do anything we would take him to the toilet after we had been out for about half hour and keep trying every half hour until he went to the toilet. Before he started using words he would become agitated and pull on our arms and we would ask home if he needed to go to the toilet at which point he would calm down and we would take him which has now progressed to him using words. I'm sorry to say this is not a quick process and he still puts a nappy on to do a poo but hopefully its gives you some assistance in your journey. My son also reacts really well to clapping and cheering so every time he told us he needed either by acting out of by talking we made a big deal about it. Whatever you try i wish you all the luck x

I think your kid just needs more repetition, and will be going on his on in a few months. I have trained three of my kids quickly , but my two Autistic kids took 6-9 months of non stop potting training.

This is a good subject. I may have to readdress a part I have overlooked. My son is 20 and often "pardon me" does not flush the toilet, and forgets to wash his hands. A special treat or reward after they do the right deed is a good way to get them to do the right thing. I tend to give my child treats whenever he wants and if I want to be really affective I won't do that. I will use those treats to reward him when he gives me the desired behavior. Thanks for reminding me of what I need to do.

Over correction/positive practice helped our son. We kept him in for 3 days and only put him in a pull up at night.Basically a strict schedule that required him to clean up after accidents and we said that it goes in the potty. Not in pants. We were matter of fact. Not angry. The BCBA suggested having him clean all. We helped because of GI issue mess. He received a sticker, special toy and praise when he went on the toilet. He started going into the bathroom on his own by the end. He never had a night accident even though we kept a pull up on at night for a short time afterwards. We were walking to therapy and he said "I need a toilet" a few days later. We put board maker pictures of a toilet around the house and his play area. He barely had an accident. A little at first because of GI issues. He learned to control and became more solid. At first, we put a pull up over his underwear when we took him out, just in case. We took him out of Summer preschool and replaced it with therapy because the school subs were not following the plan.

Hi kaydee7394, it takes time and plenty of patience, check out this video. It's a video from an ABA therapist, he explains the process for teaching your child to use the restroom, it also explains how you know when they need to use the restroom.
https://www.youtube.com/watch?v=yQEpt8DRl_4