Have you read the help files?
Take note of the bit refering to the status column on the left of the search results,dont bother with 'server' go for +available or then try available,this will ensure the person has enough upload slots available.
I too made this mistake when first trying it,but after reading the help files I'm now a convert from my usual Limewire,I find this client has all the extra info and features I require and am well happy