When you tap on the bluetooth icon, you will be redirected to the devices list screen. This list show the devices that are paired with your phone.

If you do not see your device in the list, check if it is paired with your phone. To know how to paire a device with your phone, follow this link. Flocket only support Bluetooth serial readers. Bluetooth BLE devices (Bluetooth low energy) are not yet supported by Flocket

To connect to a device simply tap on the item on the list. You will see a loading indication in the bottom of the screen. When the list item changes color, that means you are connected.