Reset to factory settings

To factory reset your tracker:

1. Attach the charging cable to your tracker and plug the other end into a USB port.
2. Press and hold the button for approximately two seconds and without letting go of the button:
   1. Remove the charging cable from your tracker.
   2. Wait about seven to nine more seconds after removing the charging cable.
3. Let go of the button and hold it down again.
4. After "ALT" and a white screen flash, let go of the button and hold it down again.
5. After you feel a vibration, let go of the button and hold it down again.
6. After you see "ERROR," let go of the button and hold it down again.
7. After you see "ERASE," let go of the button. The tracker will turn off.
8. To turn your tracker back on, press the button or attach the charging cable (make sure to plug in the other end of the cable). If the time on your tracker reads 0:00, the reset was successful.
9. Next you'll tell your Fitbit account that you're setting up a new device.
   1. If you use the Fitbit app, tap or click the account icon and choose Set Up a Device. Follow the instructions to replace your device.
   2. For fitbit.com instructions, see How do I set up my Fitbit device?

hi Shirley.
Log into your fitbit.com dashboard and click the gear icon in the top right corner. Click Settings. You'll see your personal information. Click the Reset Password link below your email address.21 Mar 2017

Help article: How do I reset or change my Fitbit password?

https://help.fitbit.com/articles/en_US/Help_article/1392
or try this link might help you out more.
how to reset my email address and password fitbit Google Search

Here is the way you can reset time on your Fitbit without Reset Fitbit Charge HR -

• Open the Fitbit app on your phone
• Then Go to the Advanced Settings
• Now turn off automatic Time Zone
• Press Select Time Zone
• Choose the time zone according to your country
• Synchronize your Fitbit to your smartphone

The Guide Of Reset Fitbit Charge HR Complete Guide

When your Fitbit isn't syncing or your device unpretentiously isn't turning on, letting all your fitness data go unauthorize is disappointing. While we love Fitbits, they're as apt to device issues as any other gadget. So, if you're intensely googling "How toReset Fitbit Charge HR" or "Fitbit charge HR not syncing" then you are at the right place. We are going to cover more than your expectation. The process of Reset Fitbit Charge HR is very easy.
Here, we are going to analyze what to do if your device isn't working properly - and when you need to perform a full factory reset.

http://help.fitbit.com/resource/manual_charge_en_US

To factory reset your tracker:
1.Attach the charging cable to your tracker and plug the other end into a USB port.
2.Press and hold the button for approximately two seconds and without letting go of the button:
3.Remove the charging cable from your tracker.
4.Wait about seven to nine more seconds after removing the charging cable.
5.Let go of the button and hold it down again.
6.After "ALT" and a white screen flash, let go of the button and hold it down again.
7.After you feel a vibration, let go of the button and hold it down again.
After you see "ERROR," let go of the button and hold it down again.
After you see "ERASE," let go of the button. The tracker will turn off.
8.To turn your tracker back on, press the button or attach the charging cable (make sure to plug in the other end of the cable). If the time on your tracker reads 0:00, the reset was successful.
9.Next you'll tell your Fitbit account that you're setting up a new tracker.
10.If you use the Fitbit app, tap or click the Account icon (User-added image) and choose Set Up a Device.
11.Follow the instructions to replace your tracker.

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