[Arneldo]

When you go onto 'Search all posts by this user' scroll down and click on 'Next Page'. then look in your address bar were you sould see somthing like:
'http://www.thisisbigbrother.com/forum/misc.php?action=search&page=2&srchuname=[USERNAME]&filter_distinct='

Insert any number after 'page' and it will take you to that page.

This is how i got it. Hope it helps and that i explained i well.