How to add some textfield in form register (laravel generator infyom)?

I read the tutorial here : http://labs.infyom.com/laravelgenerator/docs/5.3/installation

I clone the admin lte generator : https://github.com/InfyOmLabs/adminlte-generator/tree/5.3

I access it in my localhost. The register form like this : https://postimg.org/image/5gswtx4gn/

I want to add some text field and combo box. eg, level, level, username etc

When I access the code, I'm confused The code is like this :

Controller register is like this :

<?php

namespace App\Http\Controllers\Auth;

use App\User;
use Validator;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\RegistersUsers;

class RegisterController extends Controller
{
    use RegistersUsers;

    protected $redirectTo = '/home';

    public function __construct()
    {
        $this->middleware('guest');
    }

    protected function validator(array $data)
    {
        return Validator::make($data, [
            'name' => 'required|max:255',
            'email' => 'required|email|max:255|unique:users',
            'password' => 'required|min:6|confirmed',
        ]);
    }

    protected function create(array $data)
    {
        return User::create([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => bcrypt($data['password']),
        ]);
    }
}

It's load registeruser in vendor. It's like this :

<?php

namespace Illuminate\Foundation\Auth;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Auth\Events\Registered;

trait RegistersUsers
{
    use RedirectsUsers;

    public function showRegistrationForm()
    {
        return view('auth.register');
    }

    public function register(Request $request)
    {
        $this->validator($request->all())->validate();

        event(new Registered($user = $this->create($request->all())));

        $this->guard()->login($user);

        return $this->registered($request, $user)
            ?: redirect($this->redirectPath());
    }

    protected function guard()
    {
        return Auth::guard();
    }

    protected function registered(Request $request, $user)
    {
        //
    }
}

The register view is like this :

<div class="register-box-body">
    <p class="login-box-msg">Register a new membership</p>

    <form method="post" action="{{ url('/register') }}">

        {!! csrf_field() !!}

        <div class="form-group has-feedback{{ $errors->has('name') ? ' has-error' : '' }}">
            <input type="text" class="form-control" name="name" value="{{ old('name') }}" placeholder="Full Name">
            <span class="glyphicon glyphicon-user form-control-feedback"></span>

            @if ($errors->has('name'))
                <span class="help-block">
                    <strong>{{ $errors->first('name') }}</strong>
                </span>
            @endif
        </div>

        <div class="form-group has-feedback{{ $errors->has('email') ? ' has-error' : '' }}">
            <input type="email" class="form-control" name="email" value="{{ old('email') }}" placeholder="Email">
            <span class="glyphicon glyphicon-envelope form-control-feedback"></span>

            @if ($errors->has('email'))
                <span class="help-block">
                    <strong>{{ $errors->first('email') }}</strong>
                </span>
            @endif
        </div>

        <div class="form-group has-feedback{{ $errors->has('password') ? ' has-error' : '' }}">
            <input type="password" class="form-control" name="password" placeholder="Password">
            <span class="glyphicon glyphicon-lock form-control-feedback"></span>

            @if ($errors->has('password'))
                <span class="help-block">
                    <strong>{{ $errors->first('password') }}</strong>
                </span>
            @endif
        </div>

        <div class="form-group has-feedback{{ $errors->has('password_confirmation') ? ' has-error' : '' }}">
            <input type="password" name="password_confirmation" class="form-control" placeholder="Confirm password">
            <span class="glyphicon glyphicon-lock form-control-feedback"></span>

            @if ($errors->has('password_confirmation'))
                <span class="help-block">
                    <strong>{{ $errors->first('password_confirmation') }}</strong>
                </span>
            @endif
        </div>

        <div class="row">
            <div class="col-xs-8">
                <div class="checkbox icheck">
                    <label>
                        <input type="checkbox"> I agree to the <a href="#">terms</a>
                    </label>
                </div>
            </div>
            <!-- /.col -->
            <div class="col-xs-4">
                <button type="submit" class="btn btn-primary btn-block btn-flat">Register</button>
            </div>
            <!-- /.col -->
        </div>
    </form>

    <a href="{{ url('/login') }}" class="text-center">I already have a membership</a>
</div>

I want to ask, how do I add a text field and a combo box on the form to register? I am confused. because the register view called from vendor(Illuminate\Foundation\Auth\RegistersUsers)

If you want to add some custom field to your registration process because your are using official laravel auth you can add your fields in : /resources/views/auth/register.blade.php

and then you can validate and save your inputs in : /app/Http/Controllers/Auth/RegisterController.php

you don't need to add anything to registeruser in vendor because every thing you add will change and replaced after every composer install or update.