From Bright Pattern Documentation
The Internal Message scenario block is used to send an internal chat message to a specified user.
The Internal Message block may take the Failed conditional exit if the attempt to send the message has failed.
Title text is the name of the instance of the block. Enter a name in the text field and click the Update button at the bottom of the Edit pane. The new name of the block appears in the flowchart.
This is the username of the message recipient.
The message is the text of the message to be sent. Variables in the $(varname) format can be used in the message text.