You can sync your Nike+ FuelBand via your Lose It! app on iPhone/Android or on LoseIt.com.
To sync from the Lose It! app open Lose It! and select More > Apps & Devices > Nike+ FuelBand > Connect and follow the instructions provided in the app.
On Lose It.com you can login and select the Apps & Devices screen. Click Connect Connect Nike+ next to the NikeFuel integration option. You’ll be guided to login to your Nike+ account to finish the setup.