Ignition lock replacement

Okay, well I tried to find the little hole to push in under the housing to remove the ignition lock. There is no hole I looked everywhere and I mean everywhere. I am going crazy trying to figure out how to take the old one out so I can install a new one. Any thoughts? I have a tilt steering Wheel I looked at the diagram and on my truck there is no hole there to release the old ignition lock I've looked and looked and looked it just is not there so how do I get it to release without the push in pin?