profile

PROFILE  -  customize MM

Usage:  PROFILE

The PROFILE command customizes your MM environment.  It prompts you 
  with a series of questions and sets variables according to your 
  answers.  It does not go through all possible options.  (Type "set ?" 
  to see a list of all options.)

You can set any individual option with the SET command, followed by
  a SAVE-INIT.  The PROFILE command is equivalent to doing a series
  of SET commands and a SAVE-INIT.

The options are saved in a file called .mminit that you can also view
  and edit directly.

For more help type "help" and one of these topics:
  set   define   show   customization