You can change your own password in Time Tracker on the Profile page after login. Changing password on the Profile page in Time Tracker
If you are a group manager or co-manager, you can also change other user passwords on the Users page. Click on the Edit link for a corresponding user on the Users page and modify password for user on the next page. Changing password on the Users page in Time Tracker
Resetting a Forgotten Password
If you forgot your password to Time Tracker, you can reset it as described here.