How to update a prefab from a copy in the hierarchy

So, I have this basic cube with 2 buttons that change the color of the cube. I also have a prefab of the cube, but I don't know how to update the prefab with the cube in the hierarchy.

{ private GameObject Player;

 private void Start()
 {
     Player = GameObject.Find("Player");

 }

 private void Update()
 {
     Player.transform.Rotate(0, 10 * Time.deltaTime, 0);

     PlayerPrefs.Save();
 }

 public void ColorRed()
 {
     Player.GetComponent<Renderer>().material.color = Color.red;
 }

 public void ColorBlue()
 {
     Player.GetComponent<Renderer>().material.color = Color.blue;
 }

 public void BackToLoad()
 {
     SceneManager.LoadScene(1);
 }