I recommend opening a ticket with support: from 'Help & Support' at the bottom of the page there is a link to contact support.
Since I've dug it up, here 'tis:
http://support.chess.com/Tickets/Submit
Hope this helps, and good luck with your group!
Admins and Super Admins
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The Admin and Super Admin of our group has not been on line for 2 months, so we have no one in charge, can any member start a Team Match or Tourney for our members, if not, how can we install a new Super or Admin.