How can I add "Official Sites" Box to my Facebook page?

Maybe I’m not facebook savvy, but do you an example or better way of explaining?

Are you trying to add an “Official Sites” link to your own personal facebook page, or a fan page you own/edit?

Also, as @Axemusica said, do you have an example fan page that has the “Official Sites” box? The creator of the fan page could have simply added an “Official Links” section to the about section under the picture on a fan page.

Hi,
Here is an example: http://www.facebook.com/Garfield?ref=mf
There is a box at the left with “Favorite Pages”, and I so in another fan page a box called “Official Sites”.