I can't seem to select the text box at all. When I highlight the text inside and delete it, the text from the body of the form (which appears to be a separate text box with its own non-printing light border around it) moves up to replace the deleted text.

Maybe these text boxes aren't text boxes at all? Maybe they are table cells? But even then, I should be able to select them, shouldn't I?

When you said the logo might be in the header even if it doesn't look that way, I tried selecting all in the header and deleted it and that seemed to eliminate the blank header area completely when I double clicked out of it. I thought that if the logo really was in the header, it would have deleted too, but it didn't.