Write !commands in your guild-chat.
20:18 The guild commands are: <!disband>, <!invite playerName>, <!leave>, <!kick playerName>, <!revoke playerName>, <!demote playerName>, <!promote playerName>, <!passleadership playerName>, <!nick playerName, nick>, <!setrankname oldRankName, newRankName>, <!setmotd newMotd>, <!guildonline> and <!cleanmotd>.