Passwords can only be changed through the administrator's section, and only using the User Accounts section, not the Kid's List. Once you are logged in as the administrator you click on the User Accounts button in the left hand navigation menu. This will bring you to a page similar to the Kid's List. Wait a few seconds as it takes a bit for everything to load. Here you will see the Edit and Delete buttons under each user's name. Click Edit to edit the password on the account.
If you are still having trouble let us know and we will look into it some more.