Photography: canon 500d 77mm closeup lens?

I just got canon 500d 77mm closeup lens to use on nikon 70-200, but it's not working. I mean, everything is really out of focus, i can't even see anything.Am I doing something wrong. I thought it is just a screw on filter to use right away, or do i need some other accessory?

Why do you mount a nikon lens for canon? May be the focal length of canon is different than nikon. Canon lens works great on only canon body.