Can't access enum property of an instantiated prefab.

Before you direct me to: http://docs.unity3d.com/Documentation/Manual/InstantiatingPrefabs.html I could not find what I'm looking for.

And there are others that asked it too:

http://answers.unity3d.com/questions/21233/setting-properties-when-instantiating.html

http://answers.unity3d.com/questions/235943/instantiated-object-script-properties.html

But, I just don't understand it well enough due to my own lack of experience (just 2 weeks into C#) to solve my problem.

I decided that, instead of making a whole bunch of different prefabs, I just make one prefab that has a material array property and enum property.

I want to instantiate the prefab, then call a method on the instantiated gameobject to change the enum property and change it's material. I can't seem to figure out how to use GetComponent on the instantiated gameobject to do those two things.

Here is the code attached to the prefab I instantiate.

     public class PowerUpScript : MonoBehaviour {
     
         public enum EPowerUpType{Type1,Type2,Type3,Default}
 
         // powerUpType is set to Default in the unity inspector, it needs to be changed in the other class.
         public EPowerUpType powerUpType;
         
         // The inspector has 3 materials attached to this array.
         public Material[] powerUpMaterial;
     
         void SetPowerup(int i){
     //        powerUpType = EPowerUpType[i];
             GetComponent<Renderer>().material = powerUpMaterial[i];
         }
     }

This wont actually work, I commented out the powerUpType = EPowerUpType line because I have no idea how to specify it. I know enums store data as integers (Typ1=0, Typ2=1) but I can't seem to set EPowerUpType.i nor EPowerUpType[i].

Here is a snippet of the code that handles instantiating the prefab, which should also change the properties.

             switch(brickType){
             
             //...
 
             case EBrickType.Chest:
                 GameObject powerup = (GameObject)Instantiate(powerupPrefab, transform.position, transform.rotation);
                 PowerUpScript powerUpScript = powerup.GetComponent<PowerUpScript>();
                 powerUpScript.
                 break;
             }

But when I want to call powerUpScript.SetUpgrade(int); I just don't get the option to do so. Now I know that the Instantiate function returns a reference to what was just created, but apparently I'm doing something wrong here. It might be better to just change them to different prefabs, but I'm doing this to learn C# and unity so I might as well see how this way would work.