How do add scenes on the Countdown Timer

I need to add a scene on one of the line on my Countdown Timer . The scene for player just in case the player wins or loses : I also have an error : error CS0103: The name `GetInitialTime' does not exist in the current context

Here is my score script :

using UnityEngine; using System.Collections; using UnityEngine.UI;

public class ScoreManager : MonoBehaviour { public int currentScore = 0; public Text text; ScoreManager scoreManager; void Start () {
text = GetComponent (); currentScore = 0; UpdateScore(0); scoreManager = gameObject.GetComponent(); // this may not be exactly how you get a reference to ScoreManager

  }
 
  void UpdateScore(int score)
  {
      currentScore += score;
      if (text != null)
      {
          text.text = "Score :" + currentScore;
      }
   scoreManager.UpdateScore(100);
  }

}

Here is my Countdown Timer script ;using UnityEngine; using System.Collections; using UnityEngine.UI;

public class MyClock : MonoBehaviour { public int Minutes = 0; public int Seconds = 0; private Text m_text; private float m_leftTime;

  void Start ()
  {
      m_text = GetComponent<Text>();
      m_leftTime = GetInitialTime();
 
  StartCoroutine(StartTimer());

  }
 
 
  IEnumerator StartTimer()

  {
      bool done = false;
      float decrementTime = 1.0f; // default yield time (one second)
      float timeLeft = m_leftTime;
 
      while (timeLeft > 0)
      {
          if (m_text != null)
          {
              m_text.text = string.Format("{0:D2}:{1:D2}", (timeLeft / 60), (timeLeft % 60));
          }
          yield return new WaitForSeconds(decrementTime);
          timeLeft -= decrementTime;
      }
      yield return new WaitForSeconds(0.01f); // added this just incase
  }

}