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Hello @Melissa97, thanks for joining us, it's great to have you on board. 
Are you receiving an error message when trying to update the Fitbit app? If so, I would appreciate if you could reply with a screenshot of the error so I can check this further. In the meantime, please restart your phone and try to download the update again by going to the App Store and tapping on the Updates tab. If an update is needed you will be able to see the app and the Update button on the right. Once updated it should show the latest version and an Open button.
I hope this can be helpful, in case you need anything else, please keep me posted! 
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