1. When you received your card you should also have gotten a letter containing your encrypted private key.
2. Decrypt your key here
3. Import your private key in your computer wallet software such as a BlockChain.info or Electrum wallet.
4. Empty the card's address.
Your card has been secured against brute force attacks and such attacks should take the thieves months if they do not
have your PIN code.
Remember to only keep small amounts of bitcoins on your BOBC card, it is not meant as a main wallet or storage option.