In most cases, the username is the child's first initial and last name@ MPE (e.g.: John Smith: JSmith@MPE). The password is PRIDE. If your child's last name has a space or hyphen, those are included in the user name (e.g.: John Smith-Jones: JSmith-Jones@MPE or Susie Snowflake Winter: SSnowflake Winter@MPE).
Let me know if you need help.