如何启用按主题禁用的自定义域？

有人已经问过了here, 但这并不能解决我的问题。

我的主题禁用自定义字段。如何手动启用它？我想知道Wordpress使用哪种代码来显示自定义字段小部件？请帮忙。

更新：实际上，这是一个教育主题，创建了一些新的发布选项，如“课程”、“课程”&；“证明”。我想把自定义字段带到那里。

Newly created posting methods
Now custom fields option

Fuctions.php:

    <?php
//Error reporting
error_reporting(E_ERROR | E_WARNING | E_PARSE | E_COMPILE_ERROR);

//Define constants
define(\'SITE_URL\', home_url().\'/\');
define(\'AJAX_URL\', admin_url(\'admin-ajax.php\'));
define(\'THEME_PATH\', get_template_directory().\'/\');
define(\'THEME_URI\', get_template_directory_uri().\'/\');
define(\'THEME_CSS_URI\', get_stylesheet_directory_uri().\'/\');
define(\'THEMEX_PATH\', THEME_PATH.\'framework/\');
define(\'THEMEX_URI\', THEME_URI.\'framework/\');

//Set content width
$content_width=1140;

//Load language files
load_theme_textdomain(\'academy\', THEME_PATH.\'languages\');

//Include theme functions
include(THEMEX_PATH.\'functions.php\');

//Include theme configuration file
include(THEMEX_PATH.\'config.php\');

//Include core class
include(THEMEX_PATH.\'classes/themex.core.php\');

//Init theme
$theme=new ThemexCore($config);

<?php /* Plugin Name: Add CF to CPTs */ add_action( \'plugins_loaded\', \'add_cpt_support_wpse_116891\' ); function add_cpt_support_wpse_116891(){ # See /wp-admin/edit.php?post_type=SLUG add_post_type_support( \'SLUG-POST-TYPE-1\', array( \'custom-fields\' ) ); add_post_type_support( \'SLUG-POST-TYPE-2\', array( \'custom-fields\' ) ); add_post_type_support( \'SLUG-POST-TYPE-3\', array( \'custom-fields\' ) ); }

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