To contact BZFX directly, you should go to the #bzfx channel on IRC Freenode.
If you have been reprimanded by a BZFX administrator, and have a problem with it, contact that administrator first. Issues can almost always be resolved, but if it can not be, BZFX's owner, A Meteorite, will be contacted. If you need to contact A Meteorite for a reason other than administration issues, see his user page.
BZFX was started in early-2006 by A Meteorite. The exact date when BZFX started hosting servers is unknown, but the BZFX domain was registered May 29, 2006 which makes it the official birthday of BZFX.