[Evolution] Editing and removing signature files -- how to?

[Mike Lieberman <mike netwright net>]

I can see how to add new signatures, but not how to edit or delete
them. Is this simply a feature that is yet to be added? 

The 'box' below the identified signature stays empty. The edit and
remove buttons stay grayed out.

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Ellis Michael "Mike" Lieberman | Blog
Purok 13, Morales Subd.
Brgy Mabuhay, General Santos City, 9500 Philippines