WP-Autosocial main page.

1. Go to Facebook Developers.
2. Create a new app.
3. Put your domain in App Domain field and Site URL (in Website section).
4. Copy the App ID and App Secret in the correct fields. Save configuration.
5. Get the token and Facebook ask you for permissions. Allow it.
6. Now you can see your token in the readonly field and a select with your pages and your profile options.