I can tell you how to disable the security system, but I can't guarantee it will work again in the future... If interested, read on.
Under the rear passenger seat there is a wire harness. Look for the purple wire with the yellow tracer. Cut it and touch it to a ground point (scrape a spot down to metal somewhere nearby). This should disable the security system. If I remember correctly back to when I had the same problem with my 94 Grand, I actually crimped an electrical connector to the end of the wire and attached it to ground permanently with a screw. I had no security system, but I could drive my Jeep!
Sounds like you possibly went to get a copy of the original of the Jeeps key made and they did not sell you a transponder key. You need 2 original keys to program 1 new key. The car will start then shut off to to not detecting a transponder key. Most locksmith shops sell them for around $35. Dealers are $75.
You cannot shut it off.you must start it with the original learned key.when you replace keys they have to be learned.jeep dealer can do it for you.
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