As with setting productivity ratings for the various apps, you can predefine any website the same way.
- From the lower right corner of the screen, click Add Website to get started
- Enter the full domain URL of the site you're adding (http://www.sitename.com)
- Click Confirm to Save
- Now select the site name from the list, and categorize it as Productive, Neutral, Non-Productive or Prohibited
- Click Save from the bottom right of the screen when you're finished