Assuming you don't have the key and need to replace the ignition cylinder, here are the steps:
1. Remove the steering column covers. There are usually two or three screws holding them in place. With the screws removed, the covers should come right off.
2. Disconnect the wiring harness from the back of the ignition switch. You'll need a small flathead screwdriver to release the retaining clip. Once the clip is released, carefully pull out the wires and set them aside.
3. Use a small drill bit to make a hole in one ofthe tabs onthe lock cylinder housing (the part that holdsthe lock cylinderin place). This will allow youto inserta special tool called an extractor to release the locking pin inside and removethe lock cylinder without havingto destroy it .
4. Withthe lock cylinder removed, you can now accessand removethe ignition switch by unscrewing its mounting screws with a Phillips head screwdriver.