Before we start training our cats to do something or to stop doing something, we need to look at how cats learn. Cats don't understand any language and also they can not attend lectures what ever language it may be. They learn by experience. If the experience is good, they will try to repeat it. If the experience is not pleasent for them, they will try to avoid it in the future and will not learn what ever you want to make them learn. They enjoy raking the furniture with their claws, so they continue to do it. But it's quite a shock when they stick their nose in a candle flame, so they won't do that again. Its also dangourous when they put there feet into any dish that you made in the kitchen or try to spoil that.
If your cat is scratching your furniture, shredding and destroying your home, you need to realize that your cat needs to scratch and climb. Scratching conditions your cat's claws by removing the old layers of the nails. Scratching and climbing are highly enjoyable feline activities and are part of the essence of being a cat. Since your cat will want and need to scratch, provide her with a variety of scratching posts and teach her to use them. Until your cat can be trusted not to scratch and claw your furniture, she should not be allowed free run of your house when you are not there to supervise her. If your cat has a single favorite scratching site, this may be temporarily protected by covering it with some netting or loosely woven fabric. Cats do not like to snag their claws.
You can buy scratching posts at your pet store or you can build one yourself. Rough hewn 4x4's set vertically with a few horizontal resting platforms are ideal. Whether buying carpet to cover a home made post or purchasing the finished item, remember to take along a comb to check that there are no loops in the carpeting which will snag the cat's claws. You can also attach the carpeting underside-up, as the backing has a rough texture that cats enjoy.