After successfully performing a "Class Search," within the Classes component, you will be presented with a list of one or more classes. By selecting the "Edit" button next to the class you wish to work with, you will be brought to the "Class" sub-tab page.
From here you can edit (depending on your level of permissions within the system) the values associated with a given class. Simply edit the text in the available fields on this page and click the "Apply Changes" button. You can refresh the page to reflect an un-applied changes by selecting the "Refresh" button or cancel any un-applied changes and return to the "Class Search" sub-tab page by selecting the "Cancel" button.