For the safety of your Fitbit account, it’s better to change your password from time to time. That’s why we explain with simple steps how to modify your password using a desktop computer:
1 Open Fitbit.com
2 Enter your email address and password
in order to log in.
3 Choose Settings
after clicking on the gear wheel in the right top corner.
4 Change password
is a blue link that you find next to the Email address field.
5 Enter your current password
followed by the new password that you want. Click on Change password when you’re done.
Once you click now, your password will be modified immediately.
Source screenshots (& thanks to): Fitbit.com