To repay your cash advance, you'll need to use a debit card. As your Builder Card is actually a secured credit card, you aren't able to use it to repay your cash advance.
If you took out an advance before signing up for Direct Deposits, you may be in a position where your full income has been sent to your Credit Builder Card security deposit and you cannot repay your advance.
[May not be true? Is there a distinction to be drawn between repaying advances with Builder card and with security deposit?]
If that's the case, don't panic: you can get funds from your Credit Builder Card's security limit at an ATM. Please note that you'll have to pay a $2.50 fee, plus any fees charged by the ATM provider. You can then deposit those funds into any checking account with an associated debit card to repay your advance.
This solution isn't ideal and is why it's not recommended to send your entire paycheck when you sign up for Direct Deposit.