How to generate admin from admin-generator from symfony2

I am completely new to symfony2, I created a simple entity model using the orm doctrine in symfony, but I don’t know how to create and use admin-generator, I actually tried and installed all the necessary packages from this admin generator http: // symfony2admingenerator .org / . and even tried to configure it using

php app/console admin:setup

everything went fine, but I don’t know how to view the admin side regardless of whether it is generated or not.

my generator.yml

generator: admingenerator.generator.doctrine
params:  
  model: Go\UserBundle\Entity\User
  namespace_prefix: Go
  bundle_name: UserBundle
  fields: 
    firstname:
      help: If you want to see this content on you website
    lastname:
      help: If you want to see this content on you website

builders:
  list:
    params:
      firstname: Here is a beautiful title no  ???
      display: [ id, firstname, firstname, email ]
      max_per_page: 3
      actions:
        new: ~ 
      object_actions:
        edit: ~ 
        delete: ~
  filters: 
    params:
      fields:
        release_date:
          formType: date_range
      display: [ id, firstname, firstname, email ]

  new: 
    params:
      title: You're creating a new movie
      display: [ firstname, firstname, email  ]
      actions:
        list: ~
  edit: 
    params:
      title: You're editing the movie ""
      display: 
        "NONE": [ email ]
        "Other informations": [  ]
      actions:
        list: ~
  delete: ~

entity class located in

src\Go\UserBundle\Entity\User.php
src\Go\UserBundle\Entity\UserRepository.php

my admin package located in

Go\GoAdminBundle\Controller\Admin\DeleteController.php
Go\GoAdminBundle\Controller\Admin\EditController.php
Go\GoAdminBundle\Controller\Admin\ListController.php
Go\GoAdminBundle\Controller\Admin\NewController.php