Youll need to find the remote keyless entry under your dash if there is one. I dont know if they are the same as CE models which pretty much all have central locking via the key but not all have remote installed.
And if it is like CE the remote has to be programmed with the car and the key coding has to be done by mitsu or a key cutter, most of them wont guarantee key coding on CE's due to mitsubishi way of coding.
I noticed a few people have bought a fob and tried to program it because there car has central locking via key, but if there is no remote central locking installed (optional on ce's) its a waste of time.