While groups by default do not have group-specific discussions, as a teacher you likely will want to at least enable “MANAGERS” use of group discussions so that you, as the group manager (teacher) can generate new discussion threads to impart information to your classroom group. Indeed, you may wish to further enable “MEMBERS” use of group discussions so that students may start new discussion threads themselves, to ask questions or post tips or strategies.
On the group’s “SETTINGS” screen, see the “Group Discussions” switch. Select whether, and what type, of discussions you wish to enable.