How do I select object inside the game am creating?

The object that am trying to select will be spawn by the player too i all ready know how to spawn objects .but the question is how i make the player select the object when it has been spawned to perform an action when its selected ?

Object(0) selects the first instance of the object.

Object( Object.Count - 1) selects the last instance of the object.

Object(0) selects the first instance of the object.

Object( Object.Count - 1) selects the last instance of the object.

Thank you very much my friend