FB -> Toy hunters -> click the link -> fill the form -> confirm (if say your ID not match your VIP no., no need to care. Just re-confirm until the page where you can select the 3 limited items)->confirm again-> wait for the thank you page
I received the confirmation. "確認領取通知書 Verification Letter"
It might be categorised in junk mail so you may need to check.
At last I can go to sleep. Thanks to all TD brothers being helpful.