How to Hide AWP Classifieds Plugin Admin Menus

function plt_hide_another_wordpress_classifieds_plugin_menus() {
	//Hide "Classified Ads".
	remove_menu_page('awpcp.php');
	//Hide "Classified Ads → Dashboard".
	remove_submenu_page('awpcp.php', 'awpcp.php');
	//Hide "Classified Ads → Classifieds".
	remove_submenu_page('awpcp.php', 'edit.php?post_type=awpcp_listing');
	//Hide "Classified Ads → Settings".
	remove_submenu_page('awpcp.php', 'awpcp-admin-settings');
	//Hide "Classified Ads → Categories".
	remove_submenu_page('awpcp.php', 'awpcp-admin-categories');
	//Hide "Classified Ads → Form Fields".
	remove_submenu_page('awpcp.php', 'awpcp-form-fields');
	//Hide "Classified Ads → Credit Plans".
	remove_submenu_page('awpcp.php', 'awpcp-admin-credit-plans');
	//Hide "Classified Ads → Manage Credit".
	remove_submenu_page('awpcp.php', '/wp-admin/users.php?action=awpcp-manage-credits');
	//Hide "Classified Ads → Fees".
	remove_submenu_page('awpcp.php', 'awpcp-admin-fees');
	//Hide "Classified Ads → Import & Export".
	remove_submenu_page('awpcp.php', 'awpcp-tools');
	//Hide "Classified Ads → Debug".
	remove_submenu_page('awpcp.php', 'awpcp-debug');
	//Hide "Classified Ads → Uninstall".
	remove_submenu_page('awpcp.php', 'awpcp-admin-uninstall');
}

add_action('admin_menu', 'plt_hide_another_wordpress_classifieds_plugin_menus', 21);
Where do I put this code?