This page lists your messages. Above is your username (demouser). Above and below the message list is a bar of icons, which indicate the possible actions.
The icon searches this page, including the list of
new messages if there are any.
With the icon you can compose and send a new message.
For each message, the list tells you the name of the sender and the subject
of the message. Selecting this last item, you can read the text of the
corresponding message.