We're all about community and sharing information. So, we've added one more method to assist you. You can now do multi-person messages. Here are the steps.
Step 1: In your conversation, click the caret key: ^ (which is Shift-6).
Step 2: Enter the name of the person you wish to add in the find members windows.
Step 3: Click "add to chat" on the right side to include the person
You'll see the person's name listed at the top of the discussion.