1. Make sure you have enough mileage to transfer.
2. Ask about the airline's transfer policy and whether there is any extra charge.
3. Prepare personal information of yourself and the person who needs to receive mileage.
4. Log on to the airline website or submit the application by other means.
5. Confirm relevant information and wait for review.
The specific operation steps may vary from airline to airline, so it is recommended to check the specific information through official channels.