How do I use PlayerPrefs properly?

Hi, I'm trying to use my code as a countdown and race timer, which all works completely fine. But I am unsure of how to use PlayerPrefs.SetString properly so that I can output my race time to another scene which displays statistics. After setting the string I will make another script which will get the string and display it on a GUI Text.

This is what I have so far:

 using UnityEngine;
 using System.Collections;
 
 public class CountdownTimer : MonoBehaviour
 {
     // declaration
     private GameObject ball;
     private GameObject ballPosition;
     
     public float timeRemaining = 4;
 
     private GUIText myText;
 
     public GUIText myTimer;
     private float startTime;
     private bool finished = false;
 
 
     void Start()
     {
         // assigns the game object "Ball" to private variable 'ball'
         ball = GameObject.Find("Ball");
 
         // assigns the game object "Ball Position" to private variable 'ballPosition'
         ballPosition = GameObject.Find("Ball Position");
 
         // assigns the GUI Text component to private variable 'myText' and 'myText2'
         myText = GetComponent<GUIText>();
     }
 
 
     void Update ()
     {
         // if the time remaining is greater than zero
         if (timeRemaining > 0.0f)
         {
             // initialises a countdown from timeRemaining float value, 4
             timeRemaining -= Time.deltaTime;
 
             // converts float to int and displays countdown on screen
             myText.text = ((int)timeRemaining).ToString();
         }
 
         if (timeRemaining > 1.0f)
         {
             startTime = Time.time;
         }
 
         // if the time remaining is less than one
         if(timeRemaining < 1.0f)
         {            
             // displays text on screen after the countdown finishes
             myText.text = "GO!";
         }
 
         // if the time remaining is less than zero
         if(timeRemaining < 0)
         {
             // disables the GUI Text component
             myText.enabled = false;
         }
 
         // if the time remaining is less than one
         if(timeRemaining < 1.0f)
         {
             // enables the Play Maker FSM component for user input
             ball.GetComponent<PlayMakerFSM>().enabled = true;
             ballPosition.GetComponent<PlayMakerFSM>().enabled = true;
         }
 
         if(finished)
             return;
 
         float t = Time.time - startTime;
 
 
         string minutes = ((int)t / 60).ToString();
         string seconds = (t % 60).ToString("f2");
 
         myTimer.text = minutes + ":" + seconds;
     }
 
     void OnTriggerEnter(Collider other)
     {
         ball.SendMessage ("Finish!");
         ball.GetComponent<PlayMakerFSM>().enabled = false;
     }
 
     public void Finish()
     {
         finished = true;
 
         if (finished = true)
         {
             PlayerPrefs.SetInt("Race Timer", myTimer);
         }
     }
 }

Thanks in advance!