When I'm answering such questions, it is getting extremely difficult
to tell people what to do, and often leads to some confusingly broken
dialog. See for example:
http://stackoverflow.com/questions/3572450/packaging-system-in-racket
This is mostly a rant since I don't see any easy way to improve it,
especially given the problem of dealing with htdp based classes.
It doesn't look like the documentation is very explicit about how to run
r6rs programs in drracket, the only information I could find was running
programs on the command line with plt-r6rs and other such commands.
It looks like there are two places where the docs should say something
about drracket and r6rs:
http://docs.racket-lang.org/guide/standards.html?q=r6rs&q=r6rs#(part._.R6.R.S)
http://docs.racket-lang.org/r6rs/Running_Top-Level_Programs.html?q=r6rs&q=r6rs
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