Group Administrators can create special group pages for its members. These pages are viewable along with the other group navigation items as seen below.
Create a Group Page
To create a new group page, click on the gear icon in the Group Admins section. This will give you a row of Admin Options for the group. One of the options will be Group Pages.
Click on the Add Page button to create a new page. All new pages appear in the group navigation menu along with the other tabs.