Connecting the iPhone to Selphy and Printing

1. Turn the iPhone on.
2. Confirm that the iPhone is not set to [Airplane mode].
3. Tap [Settings].
4. Tap [Wi-Fi], and then set the [Wi-Fi] switch to [ON].
5. Prepare SELPHY. …
6. Access the setting screen. …
7. Check the printer name. …
8. Choose the connection method.

https://famuse.co/how-do-i-connect-my-selphy-printer-to-wifi/