Contacting the administrator of a Facebook page is not as cut and dried as it might at first seem. Since Facebook pages are used by businesses, artists and other groups, they don't have quite the same functionality as regular personal profiles. For one, Facebook pages don't have a way to simply click "Send Message" and interact in a private way with the administrator of the page. With that said, you'll have to use your imagination a bit to contact a Facebook administrator.
Log in to Facebook with your Facebook username and password.
Navigate to the Facebook page in question. In the "Write Something" box, type in a short message and ask the administrator to contact you. Since the administrator likely receives notifications when someone posts to their Wall, they'll likely get the message in a timely fashion.
Click on "Info" on the right hand side of the Facebook page. This will take you to a page with any additional information the page administrator has chosen to provide, including any websites, e-mail address or snail mail addresses for the business or group associated with the page. Jot down any e-mail addresses provided there and send them an e-mail. Also jot down the Web address and go to the link; the business' Web page may have a "Contact Us" or "About Us" page that provides more contact information.