Keyless Entry Problem

Does anyonre know how to program an existing and a new keyless entry? The car was factory equipped with a keyless entry and I lost one of them. I purchased an additional keyless entry and I have received instructions but they don't work - I can get one remote to work but not both.


Any help would be greatly appreciated.

i think you have hold them right up to the car and hold the lock and unlock button for like 15 seconds or until you here it lock or unlock, this might only work with the exsisting one....im not sure