Network two players collision

I have this script, how can i do what you told me please ?

 using UnityEngine;
 using System.Collections;
 using UnityEngine.Networking;
 
 public class AgarScript : NetworkBehaviour {
     public Rigidbody2D PlayerRigid;
     public float PlusScale;
     public float PlusScale1;
     public GameObject Player;
     //public float speed1;
 
     public Camera myCamera;
     public float speed ;
     private Vector3 mouselocation;
     private Vector3 direction;
 
 
 
     //private float movex = 0f;
     //private float movey = 0f;
 
 
 
 
     // Use this for initialization
     void Start () {
         if (!myCamera)
         {
             myCamera = Camera.main ;
         }
     }
 
     void Awake() {
         Application.targetFrameRate = 300;
     }
 
         
         
 
     
     // Update is called once per frame
 
     void Update () {
 
         if (!isLocalPlayer)
         {
             return;
         }
         //$$anonymous$$amaera sleduje hráče
         Camera.main.transform.position = new Vector3 (transform.position.x, transform.position.y, Camera.main.transform.position.z);
 
         //Pohyb myší
         mouselocation = Input.mousePosition ;
         mouselocation.z = 10 ;
         direction = myCamera.ScreenToWorldPoint( mouselocation ) ;
         transform.position = Vector3.$$anonymous$$oveTowards(transform.position , direction , speed * Time.deltaTime ) ;
 
         ////Pohyb šipkama
         ////var move = new Vector3 (Input.GetAxis ("Horizontal"), Input.GetAxis ("Vertical"), 0);
         ////transform.position += move * speed1 * Time.deltaTime;
 
 
             //Pohyb šipkama
             //movex = Input.GetAxis ("Horizontal");
             //movey = Input.GetAxis ("Vertical");
             //PlayerRigid.velocity = new Vector2 (movex * speed1, movey * speed1);
 
 
 
 
 
         if (Input.Get$$anonymous$$eyDown ($$anonymous$$eyCode.Escape))
             Application.Quit();
     
     }
     //$$anonymous$$olize
     void OnTriggerEnter2D(Collider2D col){
         if(col.gameObject.tag == "Food"){
             Destroy(col.gameObject);
             ScalePlus();
         }
 
         //if(col.gameObject.tag == "Hrac"){
         //        Destroy (col.gameObject);
         //        ScalePlus1 ();
             
         //}
 
         if(col.gameObject.tag == "Limit"){
             print ("asd");
 
 
         }
 
             
     }
 
 
     void ScalePlus(){
         gameObject.transform.localScale = new Vector3(transform.localScale.x+PlusScale,transform.localScale.y+PlusScale,transform.localScale.z);
     }
     void ScalePlus1(){
         gameObject.transform.localScale = new Vector3(transform.localScale.x+PlusScale1,transform.localScale.y+PlusScale1,transform.localScale.z);
     }
 
 
 }