To redeem a Tmall Supermarket gift card, you can follow these steps:

1. Go to the Tmall Supermarket website (https://www.tmall.com/)

2. Log in to your Tmall account

3. Once you are logged in, click on the "My Account" button in the top right corner of the page

4. In the drop-down menu, select "Coupons and Gift Cards"

5. Enter the gift card code into the "Coupon Code" field and click on "Apply"

6. The gift card balance will be applied to your account and can be used towards your next purchase on Tmall Supermarket.

7. Alternatively, you can redeem the gift card directly on the checkout page when making a purchase.

Notice! Please note that Tmall Supermarket Gift Card can be used only in tmall.com (China only) and it is limited to certain products and brands, and can only be used in a single transaction.