To apply for a Pag-IBIG multi-purpose loan as an OFW, you need to be an active member and have made at least 24 monthly contributions. Gather the required documents, including a valid ID and proof of income. You can apply online through the Pag-IBIG Fund’s website or visit a Pag-IBIG office in the Philippines. Keep in mind that the amount you can borrow will depend on your contributions and eligibility, so it's best to check the official Pag-IBIG website or contact their office for specific details and guidance.