As far as I know the Design Tables are a standard feature, so you should have it in the Student edition. (I can't check because I have the commercial package.)
Ok - please try the following: Insert>Tables>Design Table If the feature is greyed out then you probably don't have it the student edition, but I doubt this is the case.
In addition there's a tutorial on the subject: Help>SolidWorks Tutorials>All Tutorials>Design Tables
BTW, The topic heading - "Configurations: Design Tables" - is somewhat confusing because these are two different (independant) subjects. Maybe you can tell us what you're trying to do?!