Go to http://groups.yahoo.com - it will then ask you to log in using your Yahoo ID and password. Hopefully you remember that or saved it somewhere. If not there's a link you can click that says something about if you forgot your password.

Once you get to your Yahoo Groups page it will show you a list of your groups. If you are in a class and already joined the group it will show up.

Also, when you registered for the class you should have gotten an email telling you what to do. Look for that email, it might also have information you need.

Kitty