Whether you are a teacher, parent, or student, you create your Khan Academy account the same way. No matter what you select, your account will still allow you the option to learn, coach, or parent.
To create your account, go to khanacademy.org. If you click Teachers, start here or Parents, start here, you will be guided through the process of adding students or children.
If you're logged out, you'll see the options above for creating a new account on khanacademy.org