how to change main color Material

Hi i want to change main color on micro_dragon_clean
somebody help me Pls
tell me how to change it.
thank

using UnityEngine;
using System.Collections;

public class RND : MonoBehaviour 
{
	public GameObject ObjectTochangeColor;//drag the object in inspector that you want to change the color

	// Use this for initialization
	void Start () 
	{
		ObjectTochangeColor.GetComponent<Renderer> ().material.SetColor ("_Color", new Color (0.2f, 0.1f, 0.5f, 1.0f));
	}
	
	// Update is called once per frame
	void Update () 
	{
	
	}
}