There is a wiki page describing the initial startup process:
http://code.google.com/p/cropplanning/wiki/ProgramUsageIntroduction
In brief: you have to enter a text string in the upper left combobox
and click the "new" next to that box. That creates a new plan for you
to populate w/ new plantings (via the other "new" buttons).
I'm working on ideas to streamline this startup process. All ideas
are welcome.
Clayton