Select the right litter
You'll find a wide variety of litter to pick from, which can admittedly feel overwhelming. Here's the lowdown on the options. Traditional clay-based litter clumps well and is easy to scoop, but it is often dusty. Some pet parents prefer biodegradable options, such as those made from cedar, walnut shells, recycled paper, grass, wheat, or corn. Not only are they environmentally friendly, but they can also cut down on the debris your cat tracks around the house. And unscented litter is a popular option for kittens. But in the end, it's up to your cat. If her litter bothers her for whatever reason, she may find somewhere else to go. And if you find yourself with a bag of litter your cat doesn't like, don't throw it away: There just might be another use for it.
Prepare the pan properly
Fill the box with two to three inches of litter. (You can up it to four inches when she's fully grown, if she proves to be a deep scratcher). Then, advises Dr. Simms, gently place her in the box and move her paw (or your finger) in the litter to demonstrate digging. This should give her the right idea.
Keep your kitten contained at first
"Make sure that she does not have full run of your apartment or house, and confine her to a small area or room where the litter box is easy to locate," says Dr. Simms. "If she is unable to get into a box easily, she will eliminate in places she should not." Also, the box should be in a low-traffic area where there's some privacy and quiet. This isn't just a smart idea when trying to litter train a kitten—it's a smart idea for all cats. When your kitten's got the hang of this and has the full run of your home, create a cat paradise in your backyard.
How to Litter Train a Kitten, Source:https://www.rd.com/advice/pets/litter-train-kitten/