If you are on Flyfrontier.com:
1. Retrieve your reservation and manage your booking by logging into My Trip.
2. Select Change Name Details. 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!