Clicking a members names in the right side list will show the "user options" as shown in the image above and each option is explained below.
Mention Mention allows to mention a member in your message and it will appear highlighted to them.
You will be able to join the room by clicking on the "Join" button.
Some chat rooms may only be available to registered members.
Whisper After typing your message, selecting "whipser" option will send your message as a whisper.
A whisper is only visible to you and the person it was sent to.
What happened to old chat room and why introduce a new chat software?