TO CORRECT ( Please note we do not currently connect to the FitBit device only Account)
Launch Fitbit from your Home screen.
Tap on the Account tab.
Tap on the device to delete (no worries, you will reinstall as a final step).
Swipe up to scroll down to the bottom of the page.
Tap on the Remove This [Fitbit] button.
Tap on the Remove This [Fitbit] button in the confirmation dialog.
Go to https://youtu.be/ZDJm3H8_GRE for reinstallation instructions.