adding wave number to HUD

Using a script from a tutorial I found on YouTube by Brackeys and its just spawning enemies and I select which enemies and how many per wave. problem is I cant work out how to add the wave name to my HUD tried so many different options and none of it seems to be working. need the _wave.name displayed in HUD. Ignore all the comments that's just me trying to understand everything since very new to coding :D help would definitely make my day thanks.

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class WaveSpawner : MonoBehaviour {

 public enum SpawnState { SPAWNING, WAITING, COUNTING };

 [System.Serializable]                // allows us to change values inside of inspector
 public class Wave
 {
     public string name;                //name of wave
     public Transform enemy;            // refrence to prehab we want to initiate
     public int count;                // amount of waves
     public float rate;                // spawn rate
 }

 public Wave[] waves;
 private int nextWave = 0;
 public int NextWave
 {
     get { return nextWave + 1; }
 }

 public Transform[] spawnPoints;

 public float timeBetweenWaves = 5f;            //time between waves 5 seconds
 private float waveCountdown;                
 public float WaveCountdown
 {
     get { return waveCountdown; }
 }

 private float searchCountdown = 1f;            //instantiate to check if all enemy are dead every 1 second instead of every frame

 private SpawnState state = SpawnState.COUNTING;
 public SpawnState State
 {
     get { return state; }
 }

 void Start()
 {
     if (spawnPoints.Length == 0)                                
     {
         Debug.LogError("No spawn points referenced.");                        // checks if a spawn point of refrenced
     }

     waveCountdown = timeBetweenWaves;                                        //how long till next wave starts default 5seconds
 }

 void Update()
 {
     if (state == SpawnState.WAITING)                                        //checks if enimies are still alive
     {
         if (!EnemyIsAlive())
         {
             WaveCompleted();                                                // if all enimies dead start next wave
         }
         else
         {
             return;                                                            // if enemies still alive return till all enimies dead
         }
     }

     if (waveCountdown <= 0)                                                    //if <=0 then start check if spawning of not start spawning then else
     {
         if (state != SpawnState.SPAWNING)    
         {
             StartCoroutine( SpawnWave ( waves[nextWave] ) );                //start spawning wave
         }
     }
     else
     {
         waveCountdown -= Time.deltaTime;                                    //makes countdown relevent to time and not frames per second
     }
 }

 void WaveCompleted()
 {
     Debug.Log("Wave Completed!");

     state = SpawnState.COUNTING;
     waveCountdown = timeBetweenWaves;                                        

     if (nextWave + 1 > waves.Length - 1)                                    // if no more waves start wave 1 again looping
     {
         nextWave = 0;
         Debug.Log("ALL WAVES COMPLETE! Looping...");                        // if final wave not completed add 1 wave
     }
     else
     {
         nextWave++;                                                            //increases wave by 1
     }
 }

 bool EnemyIsAlive()                                                        
 {
     searchCountdown -= Time.deltaTime;                                    
     if (searchCountdown <= 0f)
     {
         searchCountdown = 1f;                                            //check if all enemy are dead every 1 second instead of every frame
         if (GameObject.FindGameObjectWithTag("Gooba") == null)            //checks if all enimies with the player tag enemy are alive or dead
         {
             return false;                                                // if enemy alive repeat step till enemies are dead check this every 1 second
         }
     }
     return true;                                                        // if all enemy with tag enemy are dead then return true
 }

 IEnumerator SpawnWave(Wave _wave)
 {
     Debug.Log("Spawning Wave: " + _wave.name);
     state = SpawnState.SPAWNING;                            //spawns enimes

     for (int i = 0; i < _wave.count; i++)                    // = number of enimies we want to spawn
     {
         SpawnEnemy(_wave.enemy);                            //waits for player to finish killing enimies
         yield return new WaitForSeconds( 1f/_wave.rate );    //how long we want to wait 1 / rate untill we have number of enimies we want to spawn
     }

     state = SpawnState.WAITING;

     yield break;
 }

 void SpawnEnemy(Transform _enemy)
 {
     Debug.Log("Spawning Enemy: " + _enemy.name);

     Transform _sp = spawnPoints[ Random.Range (0, spawnPoints.Length) ];        //chooses a random spawn point 
     Instantiate(_enemy, _sp.position, _sp.rotation);
 }

}