All your info looks normal, including the port.

I just tried the http://www3.limewire.com:6346/ and it worked, so try again. If it doesn't work again, you may be blocked by your ISP (which is outside of your machine). Call their help desk and ask if they allow connections to the gnutella network

The firewall indicator is always on until you get decent connections, so keep trying to connect.

btw, the RAM is listed in the Apple Menu->About this Mac box.