If your card starts with 5115 63, you will be able to claim your scratcher inside PayPerks for Direct Express® which you will access from directly inside your Direct Express® account. Follow the instructions here.
First check: have you entered it before? Each Scratcher Code can only be used once, so if you or a family member has already redeemed it, then you won't be able to earn those chances to win twice.
If it's a new code and no one else has used it, the next thing you should check for is a number/letter mix-up. There are a few code characters that look very similar to each other.