Browser, cute quotes. I will remember them for myself too <img src="i/expressions/face-icon-small-smile.gif" border="0">
As far as banning, I've never personally done it but when I go click on the "private messages" at the top Left of the screen (underneath cysticfibrosis.com, right underneath where you see your username when you are logged in), click on it (the words).
That will open up your history of private messages. On the top of that screen, sort of in the middle you will see some words, private messages, banning, buddy list, export private messages.... click on the banning one.
Not sure how it works from there though as I've never blocked anyone...