Hello, I am working on a spaceship game and can't get my score to show or pop up. I need help.

public class HUD : MonoBehaviour {

 public LifeIcon lifeIconObj;
 // Stores the dynamically created instances of 
 // the life icons.
 private List<LifeIcon> lifeIconInstances;

 // Contains a reference to the Text Mesh used
 // for the score text. Remember to drag drop 
 // the ScoreText game object on this variable 
 // in the editor's inspector window. 
 public TextMesh scoreTextMesh; 
 // This will contain a copy of the original text. 
 // When the text mesh is modified with dynamic
 // values, we concatenate the numeric value with 
 // this string value. 
 private string scoreText;

 // Update the score text to include the value passed
 public void updateScore (int value) {
     // Reset the text mesh's text to the orignal so 
     // the previous value is overwritten with the new one
     scoreTextMesh.text = scoreText; 
     // Add the value to the text 
     scoreTextMesh.text += value; 
 }

 public void CreateLifeIcons (int numLives){

     // Has the life icon instance list already been created? 
     if (lifeIconInstances == null) {
         // Create our list of life icons then populate
         // it with the one visually placed in the editor 
         lifeIconInstances = new List<LifeIcon> ();

         // Life Icon reference already exists so simply 
         // place it in the list. 
         lifeIconInstances.Add(lifeIconObj);

         // The positional step to offset each instanced life icon
         Vector3 positionalOffset = new Vector3(1.5f, 0, 0); 

         // Loop for each life past the first one and create a new 
         // icon for every life passed the first one
         for (int i = 1; i < numLives; ++i) 
         {
             // Create new life icon
             LifeIcon newlifeIcon; 
             newlifeIcon = Instantiate (lifeIconObj,
                 lifeIconObj.transform.position, 
                 lifeIconObj.transform.rotation) as LifeIcon; 

             // Apply positional offset
             Vector3 newPosition = newlifeIcon.transform.position; 
             newPosition.x += (positionalOffset.x * i); 
             newlifeIcon.transform.position = newPosition; 

             // Reset the scale of the icon to its identify 
             newlifeIcon.transform.localScale = new Vector3(1,1,1); 

             // Store it in our list of instances
             lifeIconInstances.Add(newlifeIcon); 

         }
     }
 }

 // Updates the life icons' active status to reflect
 // the number of lives remaining 
 public void updateLives (int numLivesRemamining){

     // Loop for each life and create a new icon for 
     // every life past the first one 
     for(int i = 0; i < lifeIconInstances.Count; ++i)
     {
         bool bActive = i < numLivesRemamining; 
         lifeIconInstances [i].gameObject.SetActive (bActive);
     }
 }
     



 // Use this for initialization
 void Start () {
     // Store a copy of the text mesh's text
     scoreText = scoreTextMesh.text;

     updateScore (10); 

     CreateLifeIcons (3); 

 }
 
 // Update is called once per frame
 void Update () {


 

 }

}