: In the MyFitnessPal app, go to Apps & Devices , find Fitbit Tracker , and tap Connect . You will be prompted to log in to your Fitbit account to authorize the link.
Early Fitbit devices used a proprietary USB dongle (a small wireless receiver) that communicated with the tracker via a low-power, proprietary 2.4GHz radio—not Bluetooth. The dongle had no intelligence on its own; it required Fitbit Connect running in the background to interpret the radio signals and pull step, sleep, and stair-climbing data from the tracker. fitbit connect
: Transferring step counts, heart rate, and sleep data from the device to the Fitbit cloud. : In the MyFitnessPal app, go to Apps