You will need a Nokia Account in order to make use of various services offered by Nokia such as training and certification.
Nokia Employee
If you are a Nokia employee you will use your existing Nokia credentials to access services.
Non-Nokia Employee
Take into account that you may already have an account to access other Nokia services.
If you do not have a Nokia account create one by following the process at https://www.nokia.com/networks/training/learning-services-exam-registration/. Please note that a Nokia login is required to access the Student Portal.