Firewall And Connection On Mac Os X Leopard

[MARIO LORDEIRO]

I need some help. Since I upgraded to Limewire 4.16 pro, I cannot connect due to a firewall warning. Acctually Limewire has always worked fine, but after also upgraded my mac to Leopard, I have no more on System Preferences, sharing, a small window where I could change the firewall settings. Now it seems to be automatic. I need help, because I have been not capable to use Limewire. I looked for everywhere and I could not get through it.
Thanks for any help.
Mario