in 10.5 and 10.6 use Workgroup manager, set preferences to ‘show all records tab and inspector’ and select PresetUsers(or PresetGroups) from the pulldown menu.
In 10.7 use Directory Utiltity, click Directory Editor, and same path.
But I am not sure if it will help to edit the entries directly if the Workgroupmanager GUI failed (which I presume you tried)
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