Do you mean private messaging? PM? Go to your User CP or click on private message in the upper right hand corner. If you want to send a private message, put your mouse over the persons name, click once and wait for the pull down menu to appear, then click on private message.
No. There was a feature where you could leave a message on someone's page that anyone could read. It's even listed in the new features thread Danny wrote. He must have had to get rid of it. It was really nice. Sigh.
