1. Go to your Prestige website. At the bottom of the log in area, you will see the forgot password link. Click on that link.
2. Enter the email that the school gave you (could be your personal email, depending on your schools procedures), that would be your personal email. Make sure the roll is set to your role. Example, student would be student, staff for staff, and so forth.
3. Hit the submit button and it will send you an email with your username and password.
4. Check that email and you can use that information to log in to prestige.
Here is a video that might help you out.