To register for the Social Security System (SSS) as an Overseas Filipino Worker (OFW) in Singapore, you need to visit the nearest SSS office or the Philippine Embassy. Bring necessary documents like your passport and proof of employment. You can also register online through the SSS website by creating an account and following the instructions provided. For detailed steps and requirements, it’s best to check the official SSS site or contact their offices for the most accurate information regarding your situation.