How can I send messages to other members?

On each member’s profile is a button with an envelope and the word “Message”.  Once you click that, it will bring up a floating message area. You can also click on the envelope icon in the site header area and click on "Compose New", then start typing in the member name of the person you wish to message in the "to" field. Options will be given based on what you are typing, and when you see the member name you wish to message, click on it to add that person to the message.