Hello,
To make changes in wp-config.php file you don’t need access to your Dashboard. You need to connect to your server using FTP, edit file and do the necessary changes. If you get these instructions from WPML support I don’t understand how is it related to our theme? We provide support for issues related strictly to our theme options, WordPress, WooCommerce, WPML plugin settings etc are out of the scope of our support.
Regards