Feb 10, 2016 - 11:48 PM
For Trainz 12, enter your serial number in MyTrainz
For Trainz A New Era, there is no Serial Number required. SImply create your MyTrainz account and enter these details in the Launcher > Trainz Settings > Internet Tab.
If you still do not have access, please submit a support ticket including your username through https://support.trainzportal.com