Click Unlock account/Change password on the Traffit login page, under the Password field:

To change the password while you are logged into Traffit, go to your profile by clicking your picture at the bottom left of the screen and select the Change password subtab:

Enter your old and new password, and click Save.

NOTE: your password should have at least 8 characters and contain both letters and numbers. To ensure your database security, Traffit will require you to change the password every 30 days.