With key removed, lock should slide into switch and 'click' into place as mechanism that holds it in the place does its thing. You may need to push into release hole with paper clip or fine punch. To remove you again use heavy duty paper clip or fine punch that you insert into a hole that is at the top of the switch again with key removed, and ease it out.

If you have a both new switch and lock combination you should be good to go.

For further info.

https://board.moparts.org/ubbthreads/ubbthreads.php/topics/617588