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If you have yet to set up your fitbit so that it's connected to your app and your account then there is a good guide for doing this at Help article: How do I set up my tracker?
If you just want to know more about syncing then have a look at this help file: https://help.fitbit.com/articles/en_US/Help_article/1877/
If you are having problems with syncing then let us have a few more details and I'm sure someone will try to help.
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