Hi Mary,

You should be able to reset your student's passwords if they are under the age of 13 by following the instructions listed here: https://support.khanacademy.org/hc/en-us/articles/203184800-How-can-I-adjust-a-student-s-settings-such-as-their-username-or-password. If your students are over the age of 13, they have the ability to reset their own password by following the instructions here: https://support.khanacademy.org/hc/en-us/articles/202487480-How-do-I-reset-my-password.

If your students are still unable to log in to their accounts, please reach out to us by filling out a support ticket. We'd be happy to help get things straightened out!

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