To apply for an SSS calamity loan, you need to check your eligibility based on the specific calamity and your membership status. You can access the application form through the SSS website or visit your nearest SSS branch. Make sure to prepare the necessary documents, such as proof of income and identification. Once completed, submit your application either online or in person, and wait for the approval notification. For the most accurate and updated information, visit the official SSS website or contact their customer service.