The CS System Administrator is Heather Miles. Her office is MOLN D120C (inside the CS Computer Lab). A message could be taped to the door or put under the door if she is not there. Her phone number is 595-2592. You can contact her by email here.
Your CS instructor's contact information should be on the syllabus for the class and is also available here.
If you cannot find a solution to your problem in these FAQs, contact your instructor or the CS System Administrator.