Note: If you know your password and just want to change it, follow the instructions here.
If you've lost or forgotten your password you can reset it from the login screen.
Go to the login screen on https://sprint.tobiipro.com/
Click on the "Don't remember your password?" link
Enter your email address and you will get an email with the subject "Reset your Tobii Pro Password password"
Click the link in the email to set a new password