M)essage margin:  The "M" command is used to alter the right margin on 
messages that you enter. This will affect all of your messages.

The margin can be set between 8 and 72 (72 is the default) by simply 
entering the desired column number when prompted to do so.

TIPS:  

1. Use the M)argin command from the editing subfunctions command line to 
change the right margin for just the current message being entered. The 
editor is accessed while entering a message.  

