To redeem a Crypto-card, just get any Crypto hot-wallet app. However you are importing a wallet, but look up the app's method on 'how to import wallet using the mnemonic phrase'. Once the wallet is imported using the mnemonic phrase, transfer all your Cryptocurrency to a secure wallet that you have if not then we recommend you to create one, whose private keys are known to only you. We recommend transferring because of overall security concerns as well as one other person besides you knowing the private key of your wallet.