rigidbody woe ?

 var Player : Transform;
 var MoveSpeed = 4;
 var MaxDist = 10;
 var MinDist = 5;
 var score : Renderer;
  
  
  
  
 function Start () 
 {
  
 }
  
 function Update () 
 {
     transform.LookAt(Player);
  
     if(Vector3.Distance(transform.position,Player.position) >= MinDist){
  
          transform.position += transform.forward*MoveSpeed*Time.deltaTime;
  
  
  
          if(Vector3.Distance(transform.position,Player.position) <= MaxDist)
              {
                 //Here Call any function U want Like Shoot at here or something
    } 
  
    }  
 }
 
 function OnColliderHit(collision:Collision){
 if(collision.gameObject.tag == "bullet"){
 print("hit");
 score.enabled = true;
 yield WaitForSeconds(2);
 score.enabled = false;
 }
 }

I want it so when my bullet hits my enemy "score" pops up. Please help I've tried google and nothing.