Student+Usernames

How do I find out students' user names and pass words*?
Go to https://spreadsheets.google.com/ccc?key=0At0lbbcHcz-HdHBLSHJnVjBLcWJweEdISFloSGNhd1E&hl=en


 * Please advise students to change their passwords to their student identification number during their first log in.