01 Lumina sedan keyless question...

I need help! I have had my 01 Lumina sedan for about a year now. It has power locks and no keyless, so I thought. When I first got it, I tried to install an aftermarket keyless setup. It was OK untill the remotes died. I can't get replacements. The other day I got a flat tire and went for the spare. There amongst the spare were 2 brand new remotes, never opened. They both work but the lights don't flash and the horn doesn't honk when locking or unlocking. How can I get the lights to flash? I tried a search and found the question asked multiple times but no answer. I already know how to add remotes etc. Thanks in advance for any help!!

-Brian

If you have that stereo with the info display (can't remember what it's called) you can change the security and power lock options through it. The owner's manual has a supplement that tells the procedure.