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A warm welcome to the Community @Valerie35. Could you please be more specific about the inconvenience you have? Are you trying to setup your Fitbit or it is already setup? If your tracker is not paired, do the following from your Android Fitbit app:
1. Open the Fitbit app.
2. Tap Join Fitbit.
3. Choose your tracker.
4. Tap Set up.
5. Enter your name, email address, and chosen password and tap Next.
6. Enter your basic profile information and tap Save. This information is used to calculate your basal metabolic rate (BMR), which helps determine your calorie count for activities.
7. Follow the onscreen instructions to continue.
Let me know how it goes. 
Best Answer