well i did that for a mod.. on the edit page for an image.. maybe that can help or point you in the direction you want..
First on the link that sends you to that page add: rel="nofollow" .
<a href="xxx" rel="nofollow">YYYY</a>
Theoretically that would be enough.. google and others will respect it when crawling your pages..
BUT it still can be indexed if some stupid people link to that page from their site, or even if someone does a google search from the google toolbar when having that page open.. (it will then be indexed as referrer - I think - not sure)
So you can do following.. in the template of that page, add the noindex code after the head tag and before the headinclude
<head>
<meta name="robots" content="noindex, nofollow" />
{vb:raw headinclude}
F.