Club representatives can be pretty much anyone in your local chapter who is able to attend a State board meeting and is willing to talk during a board meeting.
They're elected by your clubB4.2, but if your elected club rep can't attend a meeting, anyone from your club who is at the meeting can be designated as a substitute.
Each club representative is entitled to one vote for their club that is used when the board votes on proposed Bylaw amendmentsB7.4 and possible Nationals candidatesB5.4 as part of the Executive board.