Help with ontrigger enter and exit with UI Display appear and disappear

Ok so I am having a lot of trouble with this script I’ve written for my game. I’m almost done with it and this is one of the last pieces of the puzzle. I have a first person maze game, and I want the player to interact with a game object that ends up being a game point if the question is answered correctly. I only want the UI Panel to come up if the player enters the collider of the game object (game point). Then once the UI Panel comes up I want them to be able to answer the question asked by either keying in Y for yes or N for no. That or choosing a Yes button or a No button. I feel like i’m really close with my script but I keep getting this error (posted below with script) can anyone help me please.

Static member `UnityEngine.GameObject.FindGameObjectWithTag(string)’ cannot be accessed with an instance reference, qualify it with a type name instead

script is listed below

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;
using System.Collections;

public class QuestionsManager : MonoBehaviour
{
public GameObject Question1;

// Use this for initialization
void Start () 
{
 	Question1.FindGameObjectWithTag ("Level1Q1").SetActive = false;

}


void OnTriggerEnter()
{
	Question1.FindGameObjectWithTag ("Level1Q1").SetActive = true;

}

void Update()
{
	if (GetComponent<Collider>().gameObject.tag == "Level1Q1" && Input.GetKeyDown (KeyCode.N)) {
		Debug.Log ("That is the correct answer");
		Question1.FindGameObjectWithTag ("Level1Q1").SetActive = false;

	} else if (GetComponent<Collider>().gameObject.tag == "Level1Q1" && Input.GetKeyDown (KeyCode.Y)) {
		SceneManager.LoadScene ("WrongAnswerLevel1Q1");
	}
}

void OnTriggerExit()
{
	Question1.FindGameObjectWithTag ("Level1Q1").SetActive = false;
}

}

Try this instead:

using UnityEngine;
 using UnityEngine.UI; 
using UnityEngine.SceneManagement; 
using System.Collections;

public class QuestionsManager : MonoBehaviour { public GameObject Question1;

	// Use this for initialization
	void Start () 
	{
		Question1 = GameObject.FindGameObjectWithTag ("Level1Q1");
		Question1.SetActive (false);
	}

	void OnTriggerEnter()
	{
		Question1 = GameObject.FindGameObjectWithTag ("Level1Q1");
		Question1.SetActive (true);
	}
	void Update()
	{
		if (GetComponent<Collider>().gameObject.tag == "Level1Q1" && Input.GetKeyDown (KeyCode.N)) {
			Debug.Log ("That is the correct answer");
			Question1 = GameObject.FindGameObjectWithTag ("Level1Q1");
			Question1.SetActive (false);
		} else if (GetComponent<Collider>().gameObject.tag == "Level1Q1" && Input.GetKeyDown (KeyCode.Y)) {
			SceneManager.LoadScene ("WrongAnswerLevel1Q1");
		}
	}
	void OnTriggerExit()
	{
		Question1 = GameObject.FindGameObjectWithTag ("Level1Q1");
		Question1.SetActive (false);
	}

}