Hi,
This is the 'homepage' for the sample book.
It is in a file called samplebook_homepage.html
It's just a normal HTML page where you tell your visitors about your book and invite them to download it.
The book they download will contain information that you have passed to it in the F1 and F2 fields in the link to this page.
By the way as an extra you can also show these fields on this homepage.
So you should now see
Value of F1 = {F1}
Value of F2 = {F2}
Now you will want to see how these values appear in the book. You can click the link directly and read it online or right click and save the file.