By default when you register in school, you will get a Network ID. The ID should be "firstname+libraryNumber" of format. If you're not sure, please check it with IT staff. Use your ID as username and default password to login moodle.
The first time in, you'll get Profile Page to let you input details. There is a email option including a address "yourID@tedais.net". Don't modify here! Otherwise your moodle account halt on unless IT staff help you to unlock.