gail, at the top of every page is a link that says "my stuff". if you click on that, it give you another list of links that include your profile, preferences, and messages. click on the message link, and you'll get there.
also, most of the time, if you look by the "my stuff" link, when you have a new message, there is a flashing envelope that is a link too. that takes you directly to your messages.