Redeem in the app: 

Sign up for Instacart or log into your existing account 
Enter the main menu 
Tap Credits, promos & gift cards
Enter the code

Redeem on the website: 

Sign up for Instacart or log into your existing account 
Click Account or your name 
Click Add promo or gift card 
Enter the code

Card is usable, up to balance, toward eligible online orders placed on instacart.com, on “Powered by Instacart” sites, or in the Instacart app in the United States. Card is not reloadable. Not redeemable for cash unless required by law. Will not be replaced or replenished if lost, stolen or used without permission. The value of your card may only be credited to one Instacart account and will be fully redeemed upon use. Limits may apply to redemption and use. You may be required to add a secondary payment method to use Cards on Instacart’s sites. The card is not redeemable outside the U.S. Purchase, use or acceptance of card constitutes acceptance of terms. For balance inquiries/customer service, call 888-246-7822. Other terms apply see: https://www.instacart.com/help/article/promos-and-credits. Maplebear Inc., dba Instacart is card issuer and sole obligor to card owner. Instacart may delegate its issuer obligations to an assignee, without recourse. If delegated, the assignee, and not Instacart, will be sole obligor to card owner. Card does not charge a separate fee and does not expire.