If you just want to stop hearing from them while in the same chat room, just double-click on their head and choose 'Vaporize' or 'Silence' from the drop-down menu. If you want to permanently block them, add them to your Address Book, then go to your Address Book and choose to permanently vaporize and/or block ymail from them.
We realize not all Whyvillians know and understand the rules
for chat in Whyville, so we've instituted the Chat License.
You can read all about it at: The Whyville Times.
You'll need to earn your Chat License
before you can chat. (You'll also earn 150 clams when you do!)