Buffalo TeraStation HS-DTGL/R5 User Manual page 42

Group Management
Add a name and a description to the Add New
Group fields. Put checks next to each Member User.
that you want to be part of the group. Click Apply.
when your group is set up the way you want it.
To.Delete a group, put a check next to its name and
click.Delete. To add a group to your TeraStation,
click.Add.

Advanced Settings