This username and password are the Single Sign On (SSO) that you will use for accessing all your school accounts 

The username follows this format for all students (with a few exceptions):

lastnamefimi@s.dcsdk12.org      

For example if your name is Harry James Potter than you username is potterhj@s.dcsdk12.org

The password will following this format for all students (with a few exceptions):

# + the date of your birthday in 8-digits + Dcsd

For example if you were born on January 1, 2008 then your password is

#01012008Dcsd