You will get an EMS invitation via email after you have registered for courses. The invitation will be sent to your ITU email address and will include a link for you to use to set your own EMS password.
NOTE: If you have received more than one EMS invitation, use the link in the most recent invitation you received. The older links will not work.
Note that when you add or drop a course it takes up to 24 hours for the change to be reflected in the EMS. If you add or drop something today you should see the change in the EMS tomorrow.