From the Directories tab, click on Member Directory.
Search for the specific member you wish to contact using the various search criteria.
Click on the Send Message button, write your message, and click Send.
Alternately, you can click on the member's name to expand their profile. Click the button with three small dots to the left of Add as Contact. Select Send Message.
From any discussion, you can also click on a member's name to expand their profile and send a message.