Any particular topic? Perhaps a general query could be handled by any of the forum readers here.
I mean, the site has 3,000,000 members (well, sort of, at least I suppose that many have stopped by), and the "chief administrator" oversees a legion of staff and helpers. The customary approach for serious matters is to complete a 'support ticket', visit http://support.chess.com/Tickets/Submit
In theory, if the matter is considered serious enough, the chief administrator will end up seeing your report.
Else, you could just post a query in the Support forum.
sftac
Hi forum
How do I get a message to the chief administrator