Hi ccyueyue. You could redeem your VIB welcome discount at checkout. Simply enter the promotional code you received in the e-mail in the promotion code box found on the bottom left hand corner of the billing page at checkout. Please keep in mind that we only accept one promotion per order and the discount is a one-time use. I hope that answered your question and congratulations on becoming a VIB!
@lamimii - VIB is the 2nd tier of our Beauty Insider Program for clients who spend a minimum of $350 within the calendar year. More info on the program can be found here> https://www.sephora.com/profile/beautyInsider/?tab