Hi rabuzolof,

Unless your entire district is using Khan Academy, there is not a way to create an "admin" account. Instead, you will need to manually create separate accounts for each teacher, and then create classes and student accounts through each of the teacher accounts individually.

If students are in multiple classes with multiple teachers, you only need to create their account once. You can then add the students' accounts to additional teachers' classes using their class code.

If you're not familiar with the site, there are many different walkthroughs for getting started available here: https://www.khanacademy.org/khan-for-educators

I hope this helps! Please let me know if you have any additional questions!