Dear Robert,
One of the first things to do when wanting to load a USFM bible is to create a new project: File - Project - New.
Importing USFM goes like this: Open the empty project, focus it, then choose File - Import, and proceed through the Assistant. Select to import a "Bible", then choose for "... USFM", then choose the separate USFM files for import and proceed till the end of the procedure.
The "Resources" don't work properly. I always use BibleWorks or Xiphos or BibleTime as resource. (Actually I now consider it a mistake that I created "Resources" in Bibledit-Gtk, because this makes the program to want to do everything, while it would have been easier to stick to its main function of Bible Editor, and leave the Resources to other programs focused on that).
Xiphos / BibleTime / BibleWorks can focus the same passage as Bibledit-Gtk, see
https://sites.google.com/site/bibledit/extra. That makes using those resources easier, because they display the same passage as Bibledit-Gtk.
Hope all goes well,
Teus.