How to use eMule and is it more useful than the torrents?

I installed it on my computer and delete all the servers from there got new ones from here http://www.emule-security.org/serverlist/
and now when i click "conect to" on some of them nothing happens and when I try to search for something there is error message "You are not connected to a server"
I really don't know how eMule works is it like the torrents does somebody have to be online and seed something so I can download it or what.. I will realy appreciate if someone can explain this to me