Launch the app and tap on the "Choose Smart TV" button.
In the list that appears, select your device.
The next time, the application will automatically connect to the last selected device. This can be disabled in the Settings -> Reconnect to Last Device.
If you can’t find your device on the list, try tapping the “Refresh” button. If the device still does not appear, go to “Why can't I find and connect to my device?” and follow the steps indicated in the article.
If you have a device with a modern web browser, such as Chrome, Firefox, Safari, Opera, Edge, and internet browsers on Smart TVs, you can use the Mirror to Web Browser feature and mirror your iPhone or iPad screen directly to this web browser. Check "Mirror to Web Browser" for more details.
You can easily change the selected device after establishing a connection.
To do this, tap the "Change Smart TV" button and select another device.
If you don't need to change devices, then tap the “Done” button and continue with the currently selected streaming device.
After connecting to the device
you can start screen mirroring, video streaming, music streaming or photo streaming by tapping on the corresponding button.