If you (and
your spouse) did not file a 2008 Return, you must submit a signed
statement indicating that you did not file and must include an
itemization of your sources and amounts of any income you re-
ceived in 2008.

I didn't file a tax return since I'm only 17 and never had a job, but what exactly does itemization of my sources and signed statement mean? Also, what is a signed copy of an income tax return? I have my parent's copy, but what is it meant for it to be signed? Is it already signed? Sorry, if these seem like stupid questions.