There are two ways that I know of, the possibly wrong way (quicker) and the possibly right way:
1) Change all of your links to
HTML Code:
<a href="index.php?main_page=page&id=13&chapter=0#YOUR_ANCHOR_NAME">
2) Make a new define page called faq (or whatever), put everything in that, point your ez-page to that define page and change all your links to
PHP Code:
<a href="<?php echo $_SERVER['REQUEST_URI']; ?>#payment-methods">
.
(I think) The second method is better, because it won't go wrong if you change the ez-pages in some way.