Click the above link to register for the password reset portal.
You will need to register before you can reset your password.
Select User Registration and login using your network account
(include the domain) e.g. mtrx\firstname.lastname
On the Enrolment tab register either your mobile number or add an alternative email address or do both.
Hit Enroll – You’re now registered. You will only need to do this the once.
To download a copy of these instructions as a pdf click here