Change code in game like pong from computer to touch

Below is my current code and I want to change it so I can either drag the racket or where I touch the racket goes. Thanks ahead of time I am an absolute beginner.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class MoveRacket : MonoBehaviour {
5.         public float speed = 30;
6.         public string axis = "Vertical";
7.  
8.         void FixedUpdate () {
9.         float v = Input.GetAxisRaw (axis);
10.           GetComponent<Rigidbody2D> ().velocity = new Vector2 (0, v) * speed;
11.  
12.  
13.  
14.     }
15. }

 

Like I said I'm a beginner and what this is showing is really confusing me is there anybody that could help me with wrtiing the code.