go to : https://www.khanacademy.org

login with your Google account

Below your name at the top right click "settings' and change 2 things

real name: "use your first and last name here"             example: bob smith
username: "first initial, lastname, 2013"                       example: bsmith2013

click on the KHANACADAMY Logo

under the "community", go to coaches and type GHPD2K for the code and join class

Last step go to
https://www.khanacademy.org/hour-of-code/hour-of-code-tutorial

and follow the lessons