Login inC#

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class Login : MonoBehaviour
{

    public string inputUsername = "";
    public string inputPassword = "";

    string LoginURL = "http://xxnorxx.alwaysdata.net/Login.php";


    public Canvas main;
    public Canvas register;
    public Button btnReg;

    public InputField IFUsername;
    public InputField IFPassword;



    // Use this for initialization
    void Start ()
    {
        btnReg.image.fillAmount = 0;

    }

    // Update is called once per frame
    void Update ()
    {
        if (loginPress)
        {
            StartCoroutine(LoginToDB(inputUsername, inputPassword));

            //SceneManager.LoadScene("Scene2");

            inputUsername = "";
            inputPassword = "";

            loginPress = false;


}
    }

    IEnumerator LoginToDB(string username, string password)
    {
        WWWForm form = new WWWForm();
        form.AddField("usernamePost", username);
        form.AddField("passwordPost", password);

        WWW www = new WWW(LoginURL, form);
        yield return www;

        Debug.Log(www.text);
    }

    bool loginPress = false;

    public void btnLogin()
    {
        if (IFUsername.text != "" && IFPassword.text != "" && IFUsername.text != "" && IFPassword.text != "")
        {
            inputUsername = IFUsername.text;
            inputPassword = IFPassword.text;

            IFUsername.text = "";
            IFPassword.text = "";
            loginPress = true;
        }

    }

    public void btnRegPage()
    {
        main.enabled = false;
        register.enabled = true;
    }


}