set finger-command

SET FINGER-COMMAND [program]  -  define the MM finger command
Usually:           finger

The FINGER-COMMAND variable defines the program to execute when the 
  FINGER command is used in mm.  The default is the program "finger".

You can include an option in the definition, for example:
    MM>define finger-command finger -Q
  makes the mm FINGER command be the finger program with -Q option.

You may want to define the mm FINGER command as some related program like 
  xfiend, or any command you wish.  The finger program itself can also be
  executed from mm by typing "!finger".

For more information on the finger program, type "!man finger" in MM or "man 
  finger" at the shell prompt $.  See also "man xfiend".

For more help, type "help" and one of the following:
(at any prompt:)  save-init   set   show   finger   who