To use the Cash Back Vouchers:
Step 1: Go to the Rewards section..
Step 2: Click on the See Vouchers button.
Step 2: To use the voucher, you must activate it before your next purchase. To activate the voucher, slide on the SLIDE TO ACTIVATE button
Step 3: Just spend as usual and you will receive extra cash back on top of your purchase.
Do note that the usage of the voucher may be subjected to a merchant’s minimum spend.