How do I get my player to move up and down

using UnityEngine;

using System.Collections;

public class PlayerMovement : MonoBehaviour {

     public float Speed = 3f;
     public float MaxJumpTime = 2f;
     public float JumpForce;
     private float move = 0f;
     private float JumpTime = 0f;
     private bool CanJump;
     
     
     void Start () {
         JumpTime  = MaxJumpTime;
     }
     
     
     void Update ()
     {
         if (!CanJump)
             JumpTime  -= Time.deltaTime;
         if (JumpTime <= 0)
         {
             CanJump = true;
             JumpTime  = MaxJumpTime;
         }
     }
     
     void FixedUpdate () {
         move = Input.GetAxis ("Horizontal");
         GetComponent<Rigidbody2D>().velocity = new Vector2 (move * Speed, GetComponent<Rigidbody2D>().velocity.y);
         if (Input.GetKey (KeyCode.W)  && CanJump)
         {
             GetComponent<Rigidbody2D>().AddForce (new Vector2 (GetComponent<Rigidbody2D>().velocity.x,JumpForce));
             CanJump = false;
             JumpTime  = MaxJumpTime;
         }
     }
 }

At first my player just keep falling once I added a rigid-body 2D, so I click on "is Kinematic". My game was working (going left and right as I used the arrows) but when I tried to go up and down my player just doesn't go up or down, so ... could you please help me. Thank you!!! (p.s. I'm a beginner)