On this tab, you can use the matrix to set permissions for group pages. The following permissions can be assigned:
•Create pages - users can create group pages
•Delete pages - users can delete group pages
•Edit pages - users can edit group pages
These permissions can be assigned to:
•Nobody - nobody can perform the action
•All users - all users can perform the action
•Authenticated users - only signed-in users can perform the action, i.e. anonymous public users can't perform it
•Group members - only group members can perform the action, i.e. authenticated non-group members and anonymous users cannot perform it
•Authorized roles - only members of the group roles selected below can perform the action
Group admin's permissions
Group administrators can perform any of these actions, even if they don't have the permissions assigned.
More resources can be found at Developer's Guide -> Modules -> Groups -> Overview.