Write this down. It replaces any earlier code, and it will not be shown again.
Your homework and results are saved on this computer, under your account. A teacher account sees the class roll-up instead of the homework tabs. Your password is stored as a scrambled fingerprint, never as the password itself — but with no server this is a lock on the door, not a safe: someone who knows this browser well could still get at the files underneath. Do not reuse a password you care about.