Photopost does not integrate as a modules. Photopost only integrates with the user database.
I cant understand your sites language so I cant comment. Further your links above do not work.
The path you put in is your main site url
$regtext = " · <a href=\"{$Globals['vbulletin']}/modules.php?name=Forums&file=profile&mode=register\">{$Globals['pp_lang']['register']}</a>";
so your url to enter is
http://www.scrappingmemories.nl/main