You will be notified by Postal mail between May and July 2008 if you are a winner. For notification purposes they are asking your postal mail address. So, if you live in your own place and will continue to live there and receive your own mail, there is no need to fill that "In Care of".
If you are living at a friend or relative's home, and that person controls the incoming mail, then you have to list his or her name in the "in care of" line.
Student or Learner