need to delete all trace of acounts and start over.

Hi Mary,

You can delete the accounts by logging into each one and then following these instructions: https://support.khanacademy.org/hc/en-us/articles/202263014-How-do-I-delete-my-account-

If you're not able to login to the accounts, please submit a support ticket and we can assist you with deleting them!

I hope this helps! Please let me know if there's anything else I can do for you!