How to aces method in other script

Im trying to call method thats in other script ,

Im trying to do the simple test to see how it works .

FIRST SCRIPT

using UnityEngine;
using System.Collections;

public class koda : MonoBehaviour {

public kodb _kodb;
void Start () {
	_kodb.pozvanmetod ();
}

// Update is called once per frame
void Update () {

}

}

int his script Im calling method of other script , other script is kodb and I called varible that I will call it _kodb.

and this is script where method that its calling

using UnityEngine;
using System.Collections;

public class kodb : MonoBehaviour {

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {

}

public void pozvanmetod ()
{
	print ("POZVAN");

}

}

this is where my method that Im calling is , but I get error

Object refrence not set an instance of an object , I have both scripts put on two seprate objects .

You need to point the Gameobject which have the script you want to call (here kodb).
Delete public kodb _kodb; in koda, it’s useless;

Do that :
Gameobject.Find(“GameObjectWhoBearKodbScript”).GetComponent().pozvanmetod;