You have to remove the steering wheel, and it requires special tools.
how to replace master cylinder on 1996 buick regal
http://www.automotivehelper.com/topic1054152.htm or Goole "ignition switch replacement 2001 regal"
were can i locate and replace a starter for a 1998 buick regal?
I believe that the switch is located in the ignition cylinder (which you can get from any auto parts store). Unfortunately you'll need a steering wheel puller and a tilt removal mechanism before you can start with that.
How do you replace the morror assembly for a 2001 Buick Regal
buick regal
How do you replace the fuel filter on a 2003 Buick Regal?
The ignition fuses for the 1993 1993 Buick Regal 3800 is located on the car's dashboard.
how to replace a radiator in a 1996 buick regal
Why is my security light on and will not let my key come out of the ignition. 1999 buick regal
You have to get it from a Buick dealer.
A ton of Buick and GM owners replace the ignition switch so that their cars won't cut out and KILL THEM.