Edit: set****.def ( using Enter Professor's Page --> Enter Build
Problem Set Page(4) --> Edit Set Definition File(2) buttons, with
a similar setOLD.def highlighted>
After setOLD.def is edited to satisfaction, choose a new filename, eg.
setNEW.def, and click on the Save As button.
Return to Build Problem Set Page. Your new assignment,
setNEW.def should appear in the window (in alphabetical order). You
should get a confirmation page from the server, indicating that problems have
been built for N students in your class, and "FINISHED BUILDING PROBLEM SET".