If you are talking about using GD star rating in a theme file like
single.php or page.php you can use a shortcode like so:
<div class="rateit"><?php echo do_shortcode('[starrater tpl=10]'); ?></div>
You can choose which shortcode to use in the panel
of “create new post”… youll find it in the toolbar.
.
if you are talking about using a file that is completely out of wordpress
you should first “load wordpress framework” like this above everything in the page:
require( '../wordpress_install_root/wp-load.php' );
And then you the shortcode above…
.
Hope this helps.
Sagive