No problem at all.
So if I'm to understand your issue, you'd prefer your url to look like
http://www.Fo2Club.com/phpnuke or http://www.phpnuke.Fo2Club.com/ instead of http://www.Fo2Club.com/?
If it is one of the two options I've listed, all you need to do is setup a subdomain in your Web Admin Control Panel (cPanel or webhost equivalent). If I'm not mistaken, you will also need to change your site name to Fo2Club.com/phpnuke as well or all your registration e-mails will be sent out with invalid links.
Sorry I'm a bit hazy as to the exact config measures as I'm answering from work and can't remember the specifics of my subdomains. If what your trying to achieve is as above, just let me know and I can get into more specifics on how to achieve url's as above.
Thanks.