put the start nut in a socket wrench put socket wrench into your fork hit with rubber mallet until its in, using a socket wrench reduces pressure on your star nut so there is less of a chance of damaging it. Or you could simply bring it to your local bike shop and have them install it for you.
put the starnut in a socket it reduces the pressure on the starnut when u hit it with a hammer and u wont hit your hands. there's so many threads on this search doode.