Hello @BluegrassGirl and welcome to the Community. You connect your Fitbit account to you Krowdfit account from the Krowdit app. See this page. You need to search Krowdfit Support for any other help on this topic.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.
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