Did you buy LW Pro from www.limewire.com for $18.88 USD? If you bought from another site, or paid for the basic version (it's free) then you've been scammed & should read the 2 threads below

http://www.gnutellaforums.com/showth...threadid=28751
http://www.gnutellaforums.com/showth...threadid=44499

If you do have the official version of Pro, have a look through the FAQ & User Guide here
Limewire FAQ & User Guide

If your LW is not showing any search results, check the thread below
Blank results page