Its not clear what parts and controller you have?
the EDU bot from last year only runs Pbasic, not C (and by last year, I mean the 2003 competition year - the EDU robot controllers for this year were actually shipped out in the fall of 2003, but they are considered to be 2004 units)
Have you found the documentation at
www.innovationfirst.com ? the documents for the older EDU bots is all there in the 'previous' archive section.
if you have the full size robot controller from a previous year, then you will want to take a look at the archived manual from that year at
www.usfirst.org - they have all the wiring diagrams in the robot section of the manual - bwteeen those two websites you should be able to find all the instructions and drawings and schematics you need to expeiment with what you have.
Good luck towards next year - hope to see you at a regional.
and please feel welcome to continue this discussion with any questions you have - I dont mean to dismiss your questions by pointing you towards websites - most of what you need to know is already there.