If you have forgotten your password, then you will have to ask someone from your Organization that has Administrator level access or higher to reset it for you.
However, if you remember your password, but would like to change it to be something else, you can do so by logging into the Mynavistream.com website.
Once you have logged into the website, click your profile icon in the lower left-hand corner of the screen.
You'll be taken to your user account profile page. Press the Edit Profile button in the upper right-hand corner.
Enter a new password in the password field of this form and press Save Profile in the upper right-hand corner.
Your password has now been changed.