@robert i added bootstrap CDN in my theme header.php file, but it didn't affect forum page which is being loaded by wpforo plugin

@sofy i did customization as following: wp-content/themes/my-theme/wpforo/layouts/1/forum.php   is it correct???  

@sofy hi dear sofy, yes i have followed documentation , but my problem is that i want to load bootstrap into my plugin to use bootstrap tables, but ...