Hi there @amanda41479. It's awesome to have you here in the Fitbit Community! So just to have more context, is the screen just blank, or is not showing any friends or challenges?
If is the latter, make sure you are running the latest app version. In addition please log out from your Fitbit app and go to your phone settings. Access to the App manager option and look for the Fitbit app in your downloaded apps list. Once you are there, clear the app cache and data and proceed to "Force Stop" the app. Finish the workaround by restarting your phone. When your phone has initialized, go back to your app and try again.
Hope this get you back on track. I'll be around in case the issue persists.
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