How to change car ignition locks Buick LeSabre 1988?

With key in cylinder u will see a push pin,I use a very small punch or u can use a large diameter paper clip end to push the pin down & turn the lock to accessory position,if it doesn't release, try the on position,1 of the 2 positions release it 4 sure.Haven't had 2 change 1 in years,just when 1 of my buddies got a divorce r dumped a girl friend.