you may want to read "What does the URL of an iWeb website-page look like and why?" on page 45 of the E-Book to understand why the URL looks like that.
Anyway I don't think this is your problem. The problem is more that you have no text at all on your first page (entry page) and as described on p. 332 of the E-Book
The solution is to put a second Navbar at the bottom of the page made by yourself.
Which in your case for Google currently means: no text on the first page and no other page, equals no text at all on your site.
1. Add text on your first page
2. Make a menu which can be read by Google for Google to see the other pages and the text on them (instructions on p. 332-333 of the E-Book)