The online registration period for the 2013 Diversity Visa Program (DV-2013) will begin at www.dvlottery.state.gov on Tuesday, October 4, 2011, at noon, Eastern Daylight Time (EDT) (GMT-4), and conclude on Saturday, November 5, 2011, at noon, Eastern Daylight Time (EDT) (GMT-4).

Here are filing instructions:  pdf