transform.translate not working after instantiating an object

I am new to unity … I created a prefab and instantiate it but when i apply transform,translate it is not moving in any direction … I have used an empty game object

You need to have a script attached TO THAT prefab gameObject which contains the code for translation.

something like this -

void Update(){
  transform.Translate(Time.deltaTime * 20 * Vector3.Forward);
}

Hope this helps !!!