Can I get rid of our cat?
Are you kidding? Why do you want to get rid of your cat?
I'm sick of her, the stupid cat always pisses on my bed
You shouldn't rehome a cat over potty issues. You took the cat and are now responsible for it so you should train it to use the bathroom properly.
I can't train it. He doesn't listen to me.
It is hard to get a cat to listen to you but if you rehome it then you do not know if the people will treat it right. You made a commitment and you should keep it.