Need help with turn-based

Helle everyone!

I have GameController scrit wich sort all objects by initiative and change color active object.

How i can make script wich will wait for pressing a button before the next object to paint

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

public class GameController : MonoBehaviour
{
public bool active;

public List<Stats> lst = new List<Stats>(8);

public int SelIdx; // selected index
void Start()
{
active = true;
Stats[] stats = FindObjectsOfType(typeof(Stats)) as Stats[];
foreach (Stats stat in stats)
{
lst.Add(stat);
}
lst.Sort(delegate(Stats x, Stats y)
{
if (x.Initiative == y.Initiative) return 0;
else if (x.Initiative < y.Initiative) return 1;
else return -1;

});

SelIdx = 0;
lst[SelIdx].transform.renderer.material.color = Color.red;


StartCoroutine ("WaitAndChangeColor");


}

IEnumerator WaitAndChangeColor()
{
while (active)
{
yield return new WaitForSeconds(0.5f);
lst[SelIdx].transform.renderer.material.color = Color.white;
SelIdx = (SelIdx + 1) % lst.Count;
lst[SelIdx].transform.renderer.material.color = Color.red;

}
}
}

 

Code (CSharp):

1. buttonPressed = false;
2.  
3. while(buttonPressed){
4.      // do something
5.      buttonPressed = false;
6. }

buttonPressed is true when you press that button you want.

The while(buttonPressed) MUST be in a coroutine.