The 'Group Management' page enables users with 'teacher accounts' to manage the groups that they lead. On this page, they can select their group and carry out a number of different jobs.

Teachers can 'Add Courses' to their group, so that their students can access multiple courses. For example, a teacher may have signed up their students to a 'Lite Course', but later decide that they should also have access to a 'Premium Course' so that they can benefit from the extra notes, flashcards and assessments.
Teachers can also add new seats to their groups. For example, mid way through a year, a new student may join a school and therefore a class - this facility will enable the teacher to allow the new student to join the group.
So that students can enrol / register into a group, available (unused) enrolment keys can be found from the 'user' drop down.
The 'Group Management' page can also provide quick links to course progress and quiz reports for the group.