First, you should check whether YODA is installed on you system. For
high level graphics you will also need PAW++ (in
principle, everything can be performed using the plain vanilla version
of paw, but PAW++ is highly recommended).
Enter which paw++ and which yoda to see if these programs
are found in your PATH. If not, contact your local expert.
YODA uses the environment variable YODAHOCPATH to search for your
analysis tasks written in the hoc language. If it is unset YODA
will first look in your current working directory.
Assuming your hoc-files reside in /usr/users/joe/hoc you should type:
setenv YODAHOCPATH /usr/users/joe/hoc
YODAHOCPATH=/usr/users/joe/hoc; export YODAHOCPATH;
(If you do not know your shell, enter ps, which should give you
(among other things) the name of you shell).
You should do this in your .login, .profile, or whatever
the appropriate startupfile for your shell is. If you're in doubt,
contact your local administrator.