Remove ignition switch tumbler on 1990 Ford Aerostar

I have been told there will be a pin/button to push. I can't find it. I don't think there is one. do have pictures? can you tell me how to remove the tumbler and key?

Asked by for the 1990 Ford Aerostar
if you can tell me first whether you have a fixed steering column or a tilt steering column then i can post instructions for you!