You may need to download the 'local' manual as it is no longer included in the distribution for NT we recommend you use the windows help file that is included as that is a complete copy of the manual
For Unix you can download it from here ftp://ftp.netwinsite.com/pub/dnews/manual.tar.Z and then type in:
cd /usr/local/dnews uncompress manual.tar.Z tar -xvf manual.tar