Can anyone help me with how to stop a cat from crapping on the floor, even though it has a litter box??

Answers:
There are usually two reasons. First is a medical reason. There could be a problem in defecation that makes them associate the litter box with pain. The second involves the litter box itself. Cats are normally very fastidious, so when something like that happens, it is often some type of problem. For litter box issues, I have posted a link that may direct you in the right response.
For a medical problem, that is an issue for a vet.
However, if you have two cats, and only one box, that often is a set up for problems.

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You may need to take your cat to the vet, cats usually don't defecate outside their boxes without a reason. Is the box clean?
You may need to get a seperate litter box. Some cats don't like to pee and poo in the same box. That could be the problem.
Cats are usually very, very good about learning to use the litter box on their own and keeping with it. When they go outside of it there's always a reason. Either there has been changes in their enviorment and they're stressed and it's their way of acting out, their litter box is messy, they don't like using the same box, or there is a medical reason.

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read Cats for dummies Chapter 10 Vs. 12

"any cat who shitteth on thy floor shall be stoned until dead"

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cats are very clean animals the don't like to be dirty u has to put his nose in the sss.. every time he do it in the wrong place %26 u will see the results

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Is the box clean? Does it have a cover? if so, remove it.
Is it in a high-traffic area, and not a quiet, private place?
Is it near her food dish?
If she's older it could be health-related.
There is a product called Cat-Attract it's a cat litter- I have used it once and it worked good.
Is she declawed? Often the scratching process in declawed cats hurts and can reopen declaw sites.
The fact that you call your cat "it" instead of he or she tells me maybe your cat is having a protest of some sort...are you a thoughtful %26 caring owner?
Cats are very psychological animals.
Does kitty like you? Do you leave her alone all day?
Good Luck...
You don't say how old the cat is, or where she's going instead of the litter box.

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Make sure you use a good stain and odor remover, like Simple Solutions or Nature's Miracle, which are widely available. You must get the odor completely removed so he or she won't be unnecessarily tempted to repeat the mistake.
Take him to the vet to insure that there are no underlying health issues. Your vet will also be able to talk to you in depth and better assess the problem and provide advice or treatment.
Correct him with a sharp verbal command and a loud clap of the hands IF you catch him at it. Otherwise, all correction is futile.
Animals do what works. Try to think like a cat. What he is doing is not necessarily spiteful, but it could be. If so, reducing the number of changes (type of litter, type of boxes, number of boxes, type of soap used for cleaning, amount of playtime, etc.) in his world is a great way to start. Make sure his litter boxe(s) is scooped daily.
Failing all of these, try keeping a water-filled squirt gun in the fridge and bringing it out when you get home in the evening. Use it if you catch them him in the act!
Good luck!

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buy a new kind of litter of clean the box as soon as he goes