You can change your username or real name from settings (www.khanacademy.org/settings) or your profile (www.khanacademy.org/profile). For step-by-step instructions with screenshots, see Edit your account settings or Edit your profile.
Your username may be different from your real name, which is what appears on coach reports. For child accounts, username and real name are identical.
Coaches cannot change their students' usernames or real names. Learners age 13 or over can change their own usernames and real names, while only parents can change this information for learners under 13. For step-by-step instructions with screenshots, see Edit your child's settings.