Can't edit my menstrual days

[Zendia56]

After the app update, I am unable to edit the menstrual days. The app will just stop working. Anyone else facing the same thing? Using iphone SE. 

Moderator edit: subject for clarity 

[LiliyaFitbit]

Welcome to the Fitbit Community, @Zendia56.

Thanks for the details shared in your post. I recommend trying the following:

1. Log out from the Fitbit app.
2. Verify if the Fitbit app is updated to the latest version. For instructions, see this help article.
3. Force quit the Fitbit app.
4. Reboot your phone.
5. Open the Fitbit app and try to edit your details. You can confirm the steps in How do I add, edit, or delete a period in the Fitbit app?

If the issue still persists, please uninstall and reinstall the Fitbit app. 

By the way, I've moved your post to the Menstrual Health Tracking board so we can keep our forums organized.

Hope this helps.