If the ignition switch on a 1991 Ford Bronco broke how do you put in a new switch?

If you can insert the key and turn it to the run position.then look under the steering column where the key is you will see a holein the plastic cover if you push the pin inside with a paper clip or pick of some sort then you should be able to pull the switch out. if you cant get to the pin then pull the lower cover from around the steering column where the switch is located it should have only (3) Phillips screws holding it.