To cash in to your GCash account, start by opening the GCash app and logging in. Tap on the 'Cash In' option, then choose your preferred cash-in method, such as bank transfer, online payment, or over-the-counter options at partner outlets. Follow the prompts to complete the transaction, which may include entering your banking details or visiting a physical location. Always check for any service fees and processing times for your selected method. If you need further assistance, consult the GCash help centre or their official website for detailed guidance.