Without more specific information, it's challenging to provide a detailed write-up. However, here's a general overview:
If your school uses this standard Finnish authentication, you can log in using your school's official credentials (e.g., Wilma).
If you don't have MPASSid, your teacher will provide a personal name-and-key-code combination. Teachers often recommend gluing this code to the inside cover of a student's math book for easy reference.
A very specific request!
If your child comes home saying "I did my homework on Oppilaan maailma," here's what that actually means.