Move player based on UI controls

I'm trying to move the player based on UI buttons. I found this topic which covers the button listener: https://forum.unity.com/threads/touch-and-hold-a-button-on-new-ui.266065/#post-1944748

Now i know when the button is being pressed, but how can i "connect" those two scripts to make the player move?

I have this script to the player which was moving without using button.

 public class player : MonoBehaviour {
     Rigidbody m_Rigidbody;
     public float m_Speed;
 
     // Use this for initialization
     void Start () {                
         m_Rigidbody = GetComponent<Rigidbody>();
         //Set the speed of the GameObject    
     }
 
     // Update is called once per frame
     void Update () {
         /* OLD -> WITHOUT BUTTON
 
         float x = Input.GetAxis("Horizontal");
         float y = Input.GetAxis("Vertical");
 
         x = -x;
 
         m_Rigidbody.velocity = new Vector2( x * m_Speed,  y * m_Speed);
         */
     }

And this for the button:

 public class scrLeftButton : MonoBehaviour, IPointerDownHandler, IPointerUpHandler {
 
     // Use this for initialization
     void Start () {        
 
     }        
     
     // Update is called once per frame
     void Update () {
         if (!isPressed) {
             return;
         }
     }
 
     bool isPressed = false;
 
     public void OnPointerDown(PointerEventData eventData){
         isPressed = true;
     }
 
     public void OnPointerUp(PointerEventData eventData){
         isPressed = false;
     }
 
 
 }