It is likely that you just tried to register, but didn't complete all the steps. If this is true then you will be able to login with those details that you entered.
This site was set up to only allow one person per email address, to stop someone from registering twice by mistake. You could always set up a free e-mail address for your spouse, with a service like Yahoo mail for example.
To remove yourself from the site, log in and make sure you are on the Class Homepage, then go to the blue box on the right hand side of your screen. In that there is a blue link that is called "My Profile". Then click the "account" tab and look at the bottom of that page. You can remove yourself there.
To change any of your information, login and click the "My Profile" link on the right side of the page (at the top of the blue box); On the page which follows you will find options to update your profile info, login details, and profile images.
Either the pictures are not approved yet, or they didn't upload properly. If they are not up within a day, try reducing the size of the pictures and making them smaller. Then upload them again.
Unfortunately we are not able to hand out personal information and don't have access to the school's database. If they have not registered on this site, then we can not help you find them.