Chuan, you almost fell victim to a phishing attack.
Luckily, this was only a simulated attack, sponsored by Symantec. Had this been a real attack, your computer our your account credentials could have been compromised.
What you may have missed:
What now?
You've automatically been enrolled in a brief training course. You are required to complete this training. If you can't complete it now, we'll remind you to come back and finish it when you have time.