To use GCash as an OFW, start by downloading the GCash app from the App Store or Google Play. Register an account using your mobile number, then complete the identity verification process by providing your ID and other required information. Once verified, you can add funds to your GCash wallet via bank transfer, remittance partners, or over-the-counter outlets. You can use GCash for various transactions like bill payments and money transfers. For detailed steps and updates, visit the official GCash website or consult their customer support for assistance.