Take the center cap off. Unscrew the huge nut holding it in place. Use a steering wheel puller (SWP) to pop it free from the large center bolt coming out of the helm. Make sure you don't loose the "key" that is on there (little wedge piece - you will need it for the new one). If you don't own a SWP, you can rent one at any local AutoZone. Some other car parts places carry them too. Do NOT use a hammer. You could damage the helm.