Changing the PIN for your Credit Builder Card is super simple:
Head to your Spend tab and find your card
Tap "Manage card"
Select "Change PIN" (You’ll need your passcode to do this 🔒)
Using the wrong PIN too many times can block your card, so make sure you've used something secure and memorable.
Note that your PIN and your passcode are different things. If you're looking for info about your passcode, read this article.