To register for the Social Security System (SSS) as an OFW in Bahrain, you need to visit the nearest Philippine Embassy or Consulate. They will provide you with the necessary forms and guidance. You'll also need to bring valid identification and proof of your employment overseas. Alternatively, you can register online through the SSS website if you have an existing account. For more detailed steps and to ensure you have the latest information, it's best to check the SSS official site or contact the Embassy directly.