Hello There,
Thanks for writing in! It is either editing is not allowed or has something to do with file permissions. Please to access your server via SFTP, FTP, or a file manager in your hosting provider’s control panel, and look for this line:
define('DISALLOW_FILE_EDIT', true);
Either set the line to false, or remove the line (false is the default).
We would loved to know if this has work for you. Thank you.