Turn on the Bluetooth printer or scanner and make it discoverable. Just how to make the Bluetooth printer or scanner discoverable will depend on the device. To learn the way to make the Bluetooth printer or scanner discoverable, check the device's documentation or take a look at the manufacturer's https://www.bluetoothspeaker.top/bt-speaker-wireless-portable-wireless-bt-v5-0-stereo-patent-bt-speaker/