As soon as you get your new kitten. Show her the litter box. After all, you just spent a fortune on a self cleaning litter box because you hate cleaning it, so make sure that you get your money’s worth.  The first time that your kitten goes in her litter box, you should gently show her how to dig with her paws.  For the next several days, put her in the box after she eats, wakes up or plays. You’ll see how quickly she catches on.  To get her to keep using the litter box, you’ll have to keep it clean. After all you just spent a fortune on this new self cleaning litter box!  If you don’t have a self cleaning box, you should scoop after every use. Some cats are ok for a couple of days. Always change the box regularly about once or twice a week if possible.  If you need to move the litter box for any reason, just move it a few feet each day.  If your cat has accidents, never hit or punish her. Just clean the spot and go through the steps with her again.