Public string/GameObject not in inspector

Questions & Answers
1

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

public class OnTriggerLoadLevel : MonoBehaviour
{
public GameObject guiObject;
public string levelToLoad;

private void Start()
{
    guiObject.SetActive(false);

}

private void OnTriggerStay(Collider other)
{
    if (other.gameObject.tag == "soda")
    {
        guiObject.SetActive(true);
        if (guiObject.activeInHeirarchy == true && Input.GetButtonDown("Use"))
        {
            Application.LoadLevel(levelToLoad);
        }
    }
}

private void OnTriggerExit()
{
    guiObject.SetActive(false);
}

}

2

(public objects in description above script)