Assets/Scripts/Quit Menu Script.cs(24,22): error CS1525: Unexpected symbol `public'. Please Help as I am A NOOOOOOB in programming!

This is the code for my start menu- using UnityEngine; using UnityEngine.UI; using System.Collections; public class QuitMenuScript : MonoBehaviour { public Canvas quitMenu; public Button startText; public Button exitText; // Use this for initialization void Start () { quitMenu = quitMenu.GetComponent (); startText = startText.GetComponent (); exitText = exitText.GetComponent (); quitMenu.enabled = false; } // Update is called once per frame void Update () { public void ExitPress(){ quitMenu.enabled = true; startText.enabled = false; exitText.enabled = false; } public void NoPress() { quitMenu.enabled = false; startText.enabled = true; exitText.enabled = true; } public void ExitGame() { Application.Quit (); } } End! This is the place where I am recieving an error- public void ExitPress(){ quitMenu.enabled = true; startText.enabled = false; exitText.enabled = false; } It says 'Public' is an unexpected symbol! Please help and thank you!