Keep the litter box clean and make sure it's in a quiet place away from the kitten's food. Don't move the litter box around. This can confuse the kitten. If your kitten refuses to use its litter box after a few days, try using a different kind of litter. Some cats won't use clay litter because it hurts their paw pads.
Most cats prefer soft, scoopable litter .
If you have more than one cat, you should have more than one litter box. Some cats don't like to share. Cats are very clean and sensitive to odors, so in addition to scooping waste from a litter box , clean it at least once a week. When cleaning the litter box, use a mild detergent and rinse the litter box very thoroughly. Some cats won't use a litter box if you place a plastic liner inside because urine pools in the folds of the liner and causes an odor.