If your account was created by your teacher or parent you will need to ask your teacher or parent for your login details.
Only the adult who created or has access to your account details will be able to provide you with you login details. This is done to prevent others from getting access to your account and making unwanted changes.
You teacher will be able to print out a login card for you, which will include your login details to help you remember them.
You can also ask your parent to create a family account and link your school account to the family. This way your parent will be able to view your login details should you forget them.