The first step to stopping your cat from peeing on carpet is to identify the cause. Is your cat's litter box dirty? Is it in a place that your cat doesn't like?
If your cat has already peed on the carpet, it's important to clean it thoroughly. This will remove the odor, which will discourage your cat from peeing in the same spot again.
Cats prefer to use the litter box in a quiet, private spot. If your cat's litter box is in a busy or noisy area, they may be more likely to pee on the carpet instead.
If you have more than one cat, you may need to get a second litter box. This will give each cat their own space to use, and it will help to reduce competition over the litter box.
If your cat has been using the litter box just fine and suddenly starts peeing on the carpet, it's possible that they don't like the litter you're using.
If you've tried all of the above and your cat is still peeing on the carpet, it's important to take them to the vet.
It may take some time and patience to stop your cat from peeing on carpet. Be consistent with your training and don't give up.