How do I know which people are staff?

A list of The Final Horcrux staff, known as Unspeakables, are available in the "Whoever's nearest the receiver, dial six two four four two!" forum. They are also those people whose usernames are in bold on "Who's Online" and the "Active Users" sections on the bottom section of the Forums Index. The can also be see using the 'Forums Leader' link at the bottom of each page.