How to make screen move

How can I make the screen move in a simple 2d ios game, where you mustnt move lift your finger, basically like mmm fingers for ios. thanks!

Here is how to make the screen to go up:

using UnityEngine;
using System.Collections;

public class movedown : MonoBehaviour {
	float speed = 10.0f;

	void Update () 
	{
		transform.Translate (Vector2.up * speed * Time.deltaTime);
	}
}

And here is a link to make the finger on touch screen:

Only go to the part where you touch the screen.

Good Luck!