Your user name should be the same as your office 365 account. Your password should be written in the back of your composition book (my advice was to us the initials of your name and birthday - mine would be Jm0131).
To set up an account:
ELA Period 1 - class ID: 16942623 key: Period1
WSS Period 2 - class ID: 16942637 key: Period2
ELA Period 3 - class ID: 16942655 key: Period3
ELA Period 4 - class ID: 16942666 key: Period4