To enable it, open your wp-config.php file and look for
define('WP_DEBUG', false);
Change it to:
define('WP_DEBUG', true);
// Enable Debug logging to the /wp-content/debug.log file
define('WP_DEBUG_LOG', true);
// Disable display of errors and warnings
define('WP_DEBUG_DISPLAY', false);
@ini_set('display_errors', 0);
After this, repeat the action that causes the problem on your site — try to save the settings in WPML • Languages • Language URL format and get the white screen. In this case, the errors will be saved to a debug.log log file inside the /wp-content/ directory. Then, please share the errors with us. Please only share the last few messages from the time you checked this.
Sharing the debug log with you, one more thing related to the WPMl, earlier We push our site from staging to live, and we are seeing this on live site is there need to add license key here our site url is whydonate.com