A Google group is created for each class of the current semester. Class groups are created as announcement-only mailing lists which means only the instructor can send email to the group. If you wish to have open discussion among students, this is easily changed by following the link below. If you don't plan on using your class groups, you don't need to change any settings.
Class group memberships are updated nightly and synchronized with the current roster stored in the SIS. Students inquiring about adding their own email address to the group should be instructed to configure their UNI email account to forward to their outside email address.
Go here for instructions on enabling discussion and giving students access to their group: