MMTTY is one of the most popular RTTY programs around. This is the latest version and will include 
an extensive help file. However, for an even better tutorial pleaase go to:

http://www.aa5au.com/gettingstarted/rtty_start1.htm

  This is a complete tutorial and set-up procedure and should provide enough help to enable the
set-up of the program. 

  For use within N1MM Logger, you do not need the complete program, just the MMTTY engine. This 
program is also included on this disk.