How do I replace an lock ignition switch on a 1993 Jeep Wrangler?

SOURCE: 1993 jeep wrangler 4cyl -serpentine belt digram

Hope this helps,

Mike

SOURCE: how to remove the ignition switch in a 1993 Jeep Cherokee?

The ignition switch or the key cylinder?

SOURCE: 1988 Wrangler Ignition Switch Removal

There are four (sometimes two) bolts that hold the steering column to the dash. remove them & column will come down to let you get in there.
follow instruction sheet with switch. if you don't get it centered correctly it wont work correctly.

SOURCE: 2006 Jeep Wrangler won't start

First, make sure you can turn the engine by hand. If you can't then the starter can't turn it either. Have someone else turn the key and look for the source of the click...may be a relay. Go over the starting circuit with a volt meter. Check for power at the starter main terminal and then with the key turned to "start" check for power at the trigger terminal on the starter. Check battery voltage and check relay operation.
You have a neutral safety switch on the transmission if its an automatic and a clutch switch if it's a stick. Check them as well. Make sure battery grounding on fender and block are also clean and secure.

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SOURCE: 2000 jeep wrangler will not start from the key

It sounds like you have a bad neutral safety switch or your linkage is worn enough that it's not registering properly.