how can i show my high score scored in game?

i have seen previous questions related to this topic , but seems to help . So please kindly help me as this is the last phase of my game.
This is my score Script

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class ScoreController : MonoBehaviour {

	public Text ScoreText;
	public int score;
	private int Count = 2;
	public Text TotalScoreText;



	void Start () {
		
		score = 0;
		UpdateScore ();
		 
	}
	

	public	void UpdateScore() {
		
		ScoreText.text = "Score: " + score;
		TotalScoreText.text = "TOTAL SCORE -: " + score;

	}
	
	public void AddScore( )
	{
		
		score += Count;
		UpdateScore ();
		
	}


}

I guess your Unity documentation doesn’t work. Try: