To manage your reservation with Singapore Airlines, you have several convenient options. Firstly, you can visit the Singapore Airlines website and navigate to the “Manage Reservation” section. There, you will be asked to enter your booking reference number and your last name to access your booking. Through this portal, you will be able to make changes to your flight itinerary, such as selecting seats, updating contact information, and requesting special meals. Additionally, you can manage your reservation through the Singapore Airlines mobile app, available for iOS and Android devices, providing easy access to your reservation while traveling.