PieOPah; If you mean each page has too much of a margin at the top you can adjust this is the settings menu when you go to build the LRF. If you are referring to the space at the top of a page on new chapters you can remove one or both of the paragraphes that preceed the chapter heading. (Just make sure you can view the hidden formatting symbols, Ctrl-* in Windows)
I'm including pics of the LRF eBook Creator menu in BC where you would change the margin and a pic of the paragraphes inbetween the page-break and chapter heading.
-MJ