[Plugin: WordPress NextGen GalleryView] Customize the GalleryView

Hi
I would modify the template relative to the GalleryView.
I would do the GalleryView vertically and I would add a link to the big image to another page.
I would ask what are the files that I have to modify to do this?
Many Thanks

http://wordpress.org/extend/plugins/wordpress-nextgen-galleryview/