I was trying to program an extra "blank" transponder key for an add'l key to lock and unlock my pilot. in doing so, it undid the lock/unlock programming on my original key. Now I can't lock/unlock my car from the transponder. I have to put the key into the door to unlock it.

I've tried to reprogram the original key from instructions I found online, but that isn't working.

How can I get my key reprogrammed?