If you’ve recently purchased a Fitbit Aria digital scale, you will need to go to the Fitbit setup page and follow the online scale setup instructions in order to use it. This requires a wireless network, and you may need a mobile device (smart phone or tablet) such as an iPhone to setup the scale because the recommended setup software commonly fails to work properly and results in an error message during setup. You may get an error message similar to the one below.
From your mobile device, visit the mobile Fitbit Aria setup page found here:
Then follow the instructions.