custom url not linking correctly

Your “HOME” link has http://dewebstek.be/ontwerpenwp/ (not http://dewebstek.be/ontwerpenwp/menu/#section_menu). None of your 3 links have a hash (#) in their href attribute and none has rel attribute m_PageScroll2id. All 3 of your links point to different pages (./, /menu/ and /contact/).

The plugin is activated but it’s not applied on any of your links.

Well, the screenshot you posted does not match your menu links.

My guess is that the menu you see in http://dewebstek.be/ontwerpenwp/ is not a custom menu but a menu that generates your blog pages. To test this, change a label in you menu and see if it’s changed on the front-end.

Your links should be like: http://dewebstek.be/ontwerpenwp/#section_home and not http://www.dewebstek.be/ontwerpenwp/home#section_home/.

At the moment, according to the way your site pages are set, your 3 links should be:
http://dewebstek.be/ontwerpenwp/#section_home
http://dewebstek.be/ontwerpenwp/menu/#section_menu
http://dewebstek.be/ontwerpenwp/contact/#section_contact

If you include all your pages in one page (e.g. your site index), your links should be:
http://dewebstek.be/ontwerpenwp/#section_home
http://dewebstek.be/ontwerpenwp/#section_menu
http://dewebstek.be/ontwerpenwp/#section_contact

What do you mean “not correctly”? Everything seems to work as it should.

Each of your links point to a different page/URL, so when you click them, they go to that URL and then scroll the page to the target section.

If you place your links and sections on a single page/URL, each time you click a link in your menu, it’ll just scroll the page to the associated target section.

No, the page does scroll when it loads!
I think you need to resize your browser window in order to see page scrolling (make your window height short enough to see browser’s scrollbar on the right).

Then you’ll need to include all your pages content in a single page (e.g. in your index in http://dewebstek.be/ontwerpenwp/) and have your links set as:
http://dewebstek.be/ontwerpenwp/#section_home
http://dewebstek.be/ontwerpenwp/#section_menu
http://dewebstek.be/ontwerpenwp/#section_contact

The http://manos.malihu.gr/repository/page-scroll-to-id/demo/demo.html is exactly that: a single-page site example.

You can do something like this in your front-page/index:

<?php
$inc_post_id = 7 //post/page id to include
$inc_post = get_post($inc_post_id);
//post/page title
$inc_title = $inc_post->post_title;
//post/page content
$inc_content = apply_filters('the_content', $inc_post->post_content);

//output
echo '<h2>'.$inc_title.'</h2>';
echo '<div>'.$inc_content.'</div>';
?>

Searching Google for something like “include page content in wordpress template” will give you plenty results 🙂