I don't know, but you should just try until it asks you to pay. 

> Date: Thu, 29 Sep 2011 17:29:19 +0200
> From: platonides@gmail.com
> To: wikilovesmonuments@lists.wikimedia.org
> Subject: Re: [Wiki Loves Monuments] Making it into Guinness?
>
> Bas vb wrote:
> > Well who tries:
> > http://member.guinnessworldrecords.com/register/register.aspx?existing=0 ?
>
> Don't you need to pay for that?
>
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