I'll start with the most important thing - how to accustom to the tray! I was advised by a biologist, Ph.D. When they just brought the kitten into the house: leave it only in one room (where there will be a tray). Put the litter in the tray, you can wrap it in a toilet paper and leave this litter (for 2-3 days, so that the kitten is used to his toilet.) IMPORTANT !!! Do not forget! When you buy a kitten, ask for the litter of a cat (kitten or cat-mother) so that your pet can go to the toilet for this smell.On the first days, watch and guide the pet, show where his toilet is.Do not allow the kitten to mark another place.Prefine it first time, but then there will be no problems! It will only go to the tray.