Can I sign up on my own? Or open my own Schoolrunner account?

No, it's not possible to create your own account in Schoolrunner. Parent and student accounts are managed entirely by your school, so all requests and questions related to your account need to answered by the school. It's not possible to open a Schoolrunner account on your own. Please contact your teacher or school administrator for more details on your school's Schoolrunner policy.