To apply for an SSS ID, you'll need to register online at the SSS website and fill out the membership application form. You should prepare a valid identification document, such as a passport or driver's licence, along with other relevant documents like your birth certificate. After submitting your application, you can visit the nearest SSS office to complete the process and have your photo taken. For more detailed information, it's best to check the official SSS website or contact their customer service for assistance.