Mirror box at the end of the starter post?

[Winter Sonata]

Hello guys,

I am running a forum for downloads, when a user provided a mirror for download, s-he posts it as a reply , which goes to page # 000 and users maybe unaware of it,

So , I wonder if t here is any possibility to create a box at the end of the starter post in which users add their mirrors .... Can I do that?

Your help is appreciated.

Regards.