Middle of the page shows all the messages exchanged in the room.
Right side will show list of members who are present in that room.
After entering the chat you will be presented with a list of chat rooms to select from, similar to what is displayed in the above image.
Name of all the public & your private chat rooms will be displayed, alongside the number of people in each room.
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.
The options available on settings page are as below: Name colour Name colour option allows you to change your nickname's colour and will appear to others in the selected colour.