I already have (child theme) installed. No problem there !!!
I saw that Furom he had exactly the same problem and solved it.
Problem with My WPBakery Page Builder don’t work for posts
1. When I add the code to the folder (functions.php) it turns me off:
“Unable to communicate back to the site for critical errors, so the PHP change was restored. You will need to upload the PHP file in another way, such as using SFTP”.
2. Do I not add the code to the correct folder? Can you guide me better about exactly where I place the code?
Can you send me an e-mail to send you photos of exactly where I need to place the code?