Your username for all things google (sheets, docs, drive, etc) is your email address and password.
Your work issued email address is first name followed by a period and your last name @stu.northampton-k12.us,
(Ex. email@example.com) your password is the last 5 of your student ID number + the first 3 of your last name (Ex. 12345Dou)
If you cannot login to gmail with the default username and password, please reach out to your teacher or guidance counselor who can submit a request to IT