help...

hello...
im using mac os9.2....and I just got limewire so I can download mp3s.
Welll i have couple of questions...
first of all i got the free limewire and for some reason i cant play the songs off of limewire...has it not been built in for the free one?
second question is how do I get the songs into itunes?
one song i downloaded i double clicked on it and it went straight into itunes (which i was happy about) but when i tired with the others it did not work.
Is there a way to play it on itunes??PLEASE HELP!!! thanks a lot.