new keys from mits galant 240m taiwan version with 4g69 engine and 3 button keys

need help from galant enthusiast i recently purchase a 2 pcs of keys and have this keys program for the imobilizer so i can start the car itself which this have been program by mitsubishi philippines dealers and then they cant program the keyless function of the keys that comes from there dealership store. the keyless i needed is to lock and unlock the doors plus to open the rear trunk remotely due to this model have no key hole at the trunk side. my galant is labeled 240M which this is a taiwan version labeled GRUNDER a 9th generation of the said galant. the galant im refering is a 2007 design by oliver boulay. hoping someone can teach or share how to program the keyless function of the new keys i have due to im only using one key left. thank you very much