Did you purchase a new Fitbit device such as Force, Flex, One, Zip or Ultra? If yes, to start using the device, you should go to www.Fitbit.com/setup to set up your device first.
How to set up your device:
Before your setting up, please make sure the battery is in place of your device and the display is on. Then follow these steps:
Step 1: Plug the Wireless Sync Dongle into your computer’s USB port.
Step 2: Open the website link www.fitbit.com/setup in your web browser with a Internet-access computer.
Step 3: Click on the “Download Here” button to download the Fitbit Connect software for your computer (Windows or Mac). Open the file you’ve downloaded and follow the on-screen instructions to install it.
Step 4: Open the Fitbit Connect Application. From the Main Menu, select Set Up a New Fitbit Device. Then you will need to create a new account of Fitbit.com by providing your name, address, weight, high and time zone. If you already have one, just sign in with your registered username and password.
Setup 5: Select your device and click on “Next” button to start pairing your device to your Fitbit.com account. It will search for your device. Once found, it will show you that linking is complete.
When all these done, you device will pair to your account. Then it will sync your data, allow you to manage device settings, and set goals.
Please make ensure that your device is located within 5 inches of the USB dongle plugged into your computer.
Guides and Reference:
Fitbit One Product Manual
How to set up Flex on a computer?
fitbit zip setup instructions