For future usage:
post-19 is a reference to the post of your page or post, not the id of wp-float. So use the post-id of your post or page and it works.
Example:
When editing your page check the url-bar, which will show u something like this:
https://www.mysite.com/wp-admin/post.php?post=301&action=edit
Your post id will be the number behind the = sign, im my case 301.
Now for the code, which u indeed load at the end of your page or post.
change the number, which is 19 in the example above, to your own post or page id.
<script>
jQuery(document).ready(function(){
jQuery(‘#wp-float-post-301’).css(‘position’,’absolute’);
});
</script>
There u have it, Ur WP-float plugin changed to a WP-static plugin.
Cheers