How to create a new menu window

[vanesinha18a]

Hello, unity will any expert can give me a hand?

I want to bring up a window with a menu!
I play it on the menu to appear, it appears, but if I touch it in the options window disappears ...
How can I do this?

        public Rect windowRect;
    public GUISkin windowDicaSkin;
    
    public bool limao01 = false;
 
    // Use this for initialization
    void Start () {
    
    }
    
    // Update is called once per frame
    void Update () {
        if(Input.touchCount == 1){
            Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
            RaycastHit hit;
            if(Physics.Raycast(ray, out hit)){
                if(hit.transform.tag == "SairDicas"){
                    Application.LoadLevel(0);
                }
            }   
        }
        
    }
    
    void  Awake (){
        windowRect = new Rect(Screen.width / 2 - 300, Screen.height / 2 - 250, 500, 500);
    }
    
    void  WindowFunction ( int windowID  ){
        if(windowID == 0)
        {
             GUILayout.TextArea("Segundo OMS, o Brasil produz diariamente 600g de lixo por pessoa.", 400);
        }
    }
    
    void OnGUI(){
        if(Input.touchCount == 1){
            Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
            RaycastHit hit;
            if(Physics.Raycast(ray, out hit)){
                if(hit.transform.tag == "limao01"){
                    limao01 = true;
                }
                if(limao01){
                    GUI.skin = windowDicaSkin;
                    windowRect = GUI.Window(0, windowRect, WindowFunction, "", GUI.skin.GetStyle("window"));
                }
            }   
        }
    }