To Reset your Sandbox account password
1. Login
2. Click on profile photo (top right circle)
3. Select Account settings
4. Click on Update Password
5. Type in your new password and press update.
6. Lastly, Press save to save changes
NOTE: PROTECT YOURSELF ONLINE WITH A PASSWORD MANAGER!
If you have forgotten your password, you can click on forgot password
And have a reset email sent to your registered email address
And that's all! Hope it helped!