Exclude admin of search

[xony]

Hi, I'm trying to exclude myself as a user when searching for unanswered messages, but I can't seem to get it to work. I'm using this URL:

https://www.xxxx.com/search.php?do=process&contenttype=vBForum_Post&replyless=1&replylimit=0&excludeuser=User-ID

Why isn't it working for me?

Also, why am I unable to increase the limit of search results?

Thanks for your help.