The list on the right is difficult to navigate, you may have an easier job of finding a certain classroom by using the teacher's profile page.  To easily find these pages, use the link in the header, MY SCHOOL.  On the dropdown menu, click on Faculty and Staff and then choose the teacher and select the class.

If you know how to log into the webpages, you will also have all of your (or your child's) class listed on the bottom of the left sidebar under the link, My Classes.