I follow the process but i have a problem :
Erreur API Facebook:(#10) Changing app settings through API calls has been disabled for this app. Go to your app's advanced settings to enable this.
Facebook Application configuration could not be loaded. Please check your App ID and Secret Key
The app is enable in public mode
The site is on a web server test : http://add-line.com/test2/
This is caused by a setting that needs to be changed in your Facebook application. Go to developers.facebook.com and navigate to your app. In Settings tab > Advanced, the "Allow API Access to App Settings" option needs to be set to Yes. After you enable this, please try Autotune again to see if you continue to have the problem.