Add this button to the Platform Content card in the Content tab of AdminControlPanel.tsx:

                  <Button 
                    className="w-full justify-start"
                    onClick={() => setActiveTab("groups")}
                  >
                    <Users className="w-4 h-4 mr-2" />
                    Manage Groups & Communities
                    <ChevronRight className="w-4 h-4 ml-auto" />
                  </Button>

This should be added between the "Manage Support Pages" button and "App Announcements" button in the Platform Content section.