Are you saying you had this cat for some time and this is the first time you've gone anywhere near the litter box? shame!

So you cat pees like a man, instead of like a woman?? That is abnormal. Cats are supposed to act like women.

WTF? You think the OP is bright enough to be able to properly raise a child? Think about it.

And this is why you never get a cat...

Kill it and eat it. It's the only way.

How did you not figure that out right away. Cat pee has a very distinct ammonia-like smell, which most people who have had cats before will recognize from one or two accidents. And get a covered litter box. Then she wont be able to pee on the outside of the box without being outside of it. As some others suggested, you might want to take her to the vet. There could be something wrong with her, too. As for removing the yellow stains, I've got nothing. Sorry.

There is specific cat pee cleaner sold at the dollar store.. i got some the other day. I have 5 cats, including 3 strays. Also think about taking it to the vet, peeing habits tend to be a way for the cat to act out when it's sick. Getting spayed/neutered would be another option too...

your cat is going through an identity crisis

yeah this is normal if it is not fixed -_-;;;; I have never even had cat and I know this. people scare me nowadays.

I guess this shows it's a he.