How do I give an option to retry a level or return to a level selection menu opposed to just restarting the level?

I would like to give an option to either retry or go to main menu. I am brand new to coding and unity so simple basic explanations would be greatly appreciated. I would assume a “waitForSeconds” would be needed before the option appears, however I do not know how to implement that in my current scrip and this is why I have implemented application.LoadLevel(Application.loadedLevel);. instead. As you will notice the first two public game objects are not put into use simply because Im unsure how at this time. Here is the script that I have for now.
Please do not be rude. I have hesitated to ask this question for the last 2 days simply because I don’t want someone to make a newbie feel like an idiot.

using UnityEngine;
using System.Collections;

public class TimeText : MonoBehaviour
{
public GameObject gameOverText;
public GameObject restartButton;
public GUIText timeText;
public float timer = 30.00F;

// Update is called once per frame
void Update () 
{
			timer -= Time.deltaTime;
	
			timeText.text = "Remaining Time " + timer.ToString ("0.00");
	
			if (timer <= 0) {
					timeText.text = " Score";
					Time.timeScale = 0;
		Application.LoadLevel(Application.loadedLevel);

	}
}

}

Well, I’m kinda newbie to Unity too, so hi fella.

Anyway, I would suggest you create a state system for controlling your game’s state. When inside the “game over” state, you display the buttons for restarting the level or going back to main menu. I think it would also be better to make a different Scene for the main menu, this way you can use the Application.LoadLevel() to load between main menu and in-game. For example :

enum GAMESTATE {PLAYING=0, GAMEOVER};

function Start() {
   GAMESTATE currentState = GAMESTATE.PLAYING;
}
function OnGUI() {

   if (currentState == GAMESTATE.GAMEOVER){
      if (GUI.Button(new Rect(0, 0, 50, 20), "Retry")) {
         Application.LoadLevel(Application.loadedLevel); // restart the level
      }

      if (GUI.Button(new Rect(0, 0, 50, 20), "Exit")) {
         Application.LoadLevel(0); // go back to main menu
      }
   }
}

The LoadLevel(0) is assuming the index of main menu’s scene is 0, you can set this in the Build Settings. Hopefully this can help you a bit.