You need to contact your class teacher or school administrator. Only these users have the opportunity unlock your account
If during registration you indicated your email, you need to go to the page password reset. Enter your login or email and click "Send Request". On the instructions will be sent to your email.
If you didn’t provide an email address during registration, or don’t remember it, you need to contact the class teacher (for students and parents) or system administrator (for school staff).