How to get to the fish eye setting on my nikon d5000?

I have a nikon d5000, and i want to do the fisheye feature, but i don't know where to go. I just got this camera and new to photography and i would really appreciate if you can help me out!

Doesn't exist. Yes that's true, you need a fish eye lens. Where did you get the idea that any camera would have such a gimmick?