Error: Only assignment, call, increment, decrement, and new object expressions can be...

 using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CapsuleMove : MonoBehaviour
{
    [SerializeField] private float _speed = 1f;

    private Vector3 _newPosition;

    private void Update()
    {
        if(Time.time > 1f && Time.time < 2f)
            Move();
    }

    private void Move()
    {
        _newPosition = new Vector3(transform.position.x,
                                   transform.position.y,
                                   transform.position.z + _speed);
        transform.position + _newPosition;
    }
}