Change Object Material With a button C#

I’m trying to figure out how to change the material on an object using a button, so far I have this but I’m not fully understanding the reference to the game object that needs the material changed.

using UnityEngine;
using System.Collections;

public class VideoScreenManager : MonoBehaviour {

	//Material Reference
	public Material newMaterialRef01;
	public Material newMaterialRef02;
	public Material newMaterialRef03;
	public Material newMaterialRef04;
	public Material newMaterialRef05;
	public Material newMaterialRef06; //Default White Material

	public void  GoColor01(){"VideoPlayerScreen").renderer.material.color = newMaterialRef01;

You’re trying to set a color property with a material.

Try this:"VideoPlayerScreen").renderer.material = newMaterialRef01;