The items marked with * below (such as “Name”) are mandatory fields and must be filled before you press the “Submit” button. In case any of the mandatory fields is left unfilled and you press the “Submit” button, you will get an error message, that is, registration is incomplete and you need to fill in the mandatory fields again.
The other items not marked with * are optional items which you may fill if you wish. That is, your registration will be considered complete even if you do not fill any (or all) of the optional fields.