After downloading the Bitkey App and activating your Bitkey hardware device with a tap when instructed, you should see it transition from a pulsing white light to a solid one, with instructions to begin scanning fingers to pair a finger with your device to be used to unlock it later.
To scan your fingerprint, using a clean and dry finger, gently place it on the sensor. When the LED turns blue, lift your finger off the sensor and then gently place it back on the sensor. Continue until you see a green LED. The green LED indicates you have successfully completed the fingerprint scan.
To save the fingerprint scans, hold your hardware device to the back of your phone until you see a message that confirms it was successfully saved. Make sure you remember what finger you scanned as only that finger will be able to unlock the hardware device and approve transactions.