You'll need to create an account with Fitbit.
How to Add New Fitbit Device to Fitbit Account — Max Dalton Tutorials
How do I use the Fitbit app?
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How to Add New Fitbit Device to Fitbit Account — Max Dalton Tutorials
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How to Use Fitbit Versa
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How to Add New Fitbit Device to Fitbit Account — Max Dalton Tutorials
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How to add, replace, and delete trackers in the Fitbit app | Android Central
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