??? about useing a lens??

Hi, so i am new to photography and i recently got a 12mm fisheye wide angle lens to use on my NIKON D70S. That all also got recently. ok so h4re is my problem the seller did not in the add that the mount was screw on. So i was wondering if any of you more experienced photographer had any idea if there is a special extension that i would use with it? i do get it that every thing will be manual if there is even a way to do it. If not i can return it and pay return shipping and a 20% restocking...

??? about useing a lens?? ??? about useing a lens??