In order to read the comments posted, you'll have to click-and-drag over each reply to read the message, since white words on a white page will be...well, white (invisible).
Use the following code to write your 'secret' message (omit the ! exclamation mark to make your code work ):
[color!=ffffff]Your Message Here.[/color]
Or click here to learn more about changing the color of the font, and some other fun things.