how to make a Login Window with unity and c#

hey I am trying to make a login window using a dictionary in c#. I am finding it difficult to find a way to get the gameobjects to work with the code. I have designed the login window in Unity and want to link the username and password field to look through the dictionary and "login" once a pair have been found. anyone able to help me sort this out would be great.

   using System.Collections;
   using System.Collections.Generic;
   using UnityEngine;

   public class AdminLogin : MonoBehaviour
   {
 

     Dictionary<int, string> staffDetails = new Dictionary<int, string>
     {
         {101,"femi1998" },
         {102,"kwaks1999" },
         {103,"eman1999" }
     };
 

      public void adminDetails()
     {
          int userName = ...;
         string password = ...;

         string foundPassword;
          if (staffDetails.TryGetValue(userName, out foundPassword) && (foundPassword == password))
          {
              System.Console.WriteLine("User authenticated");
          }  
          else
          {
             System.Console.WriteLine("Invalid password");
          }

     }
 }