Player prefs confusion + high score display (Java)

I have to make a high score display on the game over and menu scene, Right now I have just once you die, it displays the score you had gotten from that run on the game over scene and then resets wen you go back to menu. I have no idea how to use player prefs at all. No idea how to save or retrieve date from it. Basically I need to save the scores I get and then make the one with the highest value display on a different (the gameover and menu) scenes.

Score Script(JAVA):

   static var CurrentScore : int;
   var InternalScore : int;
   
   var ScoreText : GameObject;
   
   function Update () {
   
   
       InternalScore = CurrentScore;
       ScoreText.GetComponent.<Text>().text = "" + InternalScore;
   }

Don't know if this is needed, but this is how you obtain points: (java)

   function DeductPoints (DamageAmount : int) {
       GlobalScore.CurrentScore +=10;
   }