shoutbox is pretty simple
These commands are shortcuts to doing various things, such as pruning the box (if you have permissions), to ignoring other users.
These same commands can be typed into the box, but the menu shortcuts this by placing it in the text area. For example you can ignore a user by typing /ignore username. Replace ‘username’ with the username of the user you want to ignore.
Other Features
Editing or Deleting a shout (if you have permissions to do so) is as simple as double clicking on the shout in the main shoutbox window, and then an option to edit, delete or clear the content. Pressing ESC will abandon the edit or delete.
You can choose to shout to specific users by clicking on the ‘To Everyone’ menu next to the Shout button. Enter the username of the user you want to send a message to (labelled a PM). If you select a specific user, only you and that user will see the message.
The Editor controls are fairly standard across vBulletin, and the Shoutbox makes available most of the basic ones. Additionally you can click on the mute/unmute image which will stop any alarm noises being made when new shouts are made.