There are several methods:
Method 1. Go to the forum. Find a post written by the user. Select the username. Click on "Messages" at top of screen. Select "Send Private Message"
Method 2. Go to your profile. Scroll down to the tabs and select "Connections". (Please note: this is not the "Connections" tab at top of screen). Select the PM button: 
Method 3. Go to the "Compose" screen. In the "To:" box start typing the name. It will offer you a list of users of that name. If it isn't a user it will highlight red and tell you that.
Method 4: Go to "User List" in the User Menu to the left of screen and enter their username in the search box.
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