how to make information slideshow?

Hello, I am quite new to Unity and need help with a simple task. I want to make information slideshow with GUI.button and it does not run. This is my script so far:

 using UnityEngine;
     using System.Collections;
     
     public class InfoKlik : MonoBehaviour {
     
         public Transform target1;
         public string info1,info2,info3;
         public Vector2 scrollPosition1 = Vector2.zero;
         public bool show=false;
         public GUISkin guiSkin;
         private float  guiRatio;
         private float  sWidth;
         private Vector3 GUIsF;
         public float X = 0; 
         public float Y = 0; 
         public float width = 10f; 
         public float height = 5f; 
     
         void Awake(){
             sWidth = Screen.width;
             guiRatio = sWidth/1920;
             GUIsF = new Vector3(guiRatio,guiRatio,1);  }
     
         void OnGUI(){
             if(GUI.Button((new Rect (X, Y, width, height),"Hello"))
             {
                 ShowInfromation ();
             }
             
         void ShowInformation(){
                 GUI.BeginGroup(new Rect(Screen.width/2-200,Screen.height/2-250,800,500));
                 GUI.Box(new Rect(0,50,405,360),"Infromation");
     
                 scrollPosition1 = GUI.BeginScrollView(new Rect(30,0,250,390),scrollPosition1, new Rect(0,0,1150,200));
     
                 info1 = GUI.TextArea(new Rect(0,300,500,50),info1,200);
     
                 info2 = GUI.TextArea(new Rect(400,300,350,50),info2,200);
     
                 info3 = GUI.TextArea(new Rect(800,300,350,50),info3,200);
     
                 GUI.EndScrollView();
                 GUI.EndGroup();
     
             }
            }
     }