If you are on Flyfrontier.com:
1. Ingresa a Mi viaje para ver y gestionar tu reserva.
2. Selecciona Cambiar nombre. Enter your FRONTIER Miles number and select Continue.
3. Review the changes, select Confirm Changes and you're all done!
If you are on the Frontier Mobile App:
1. Retrieve your reservation by looking up your trip under 'My Trips'
2. On the Manage My Booking page, select the Passenger Card
3. Enter Your FRONTIER Miles Number and Select Continue
4. You are all done!