All chat rules are listed on the Wurm forum [http://forum.wurmonline.com/index.php?/topic/2126-chat-rules/ here].
If players do not follow the rules they can find themselves warned (mutewarn), or muted. Muted means that they cannot talk in any channels (other than Private chats) channel until the mute expires or is lifted. This includes asking for "help/guards!" from the Tower Guards.
If you receive a mutewarn, do not argue or sound off in the public chat channels ! Starting an argument in public after a mutewarn is likely to get you muted.
If you disagree with a mutewarn or a mute, send the CM a '''private''' message to disscuss discuss the situation. If you don't want to deal the person who muted you, you can talk to any other CM or GM.