At this time, Code.org does not offer any administrator level accounts, or any account that can control / oversee other teacher accounts. We only offer teacher and student accounts at this time - though this is something we are considering for the future!
If you'd like to gain access to the classes in your district, the teachers will need to make a copy of their sections into a section under your teacher account (if they've been created using section codes).
For additional assistance, reach out to support@code.org!