I have download Limewire 3.0.2 on my Mac OS 9.1. The installation runs normally but I can't connect, the button is red instead of green and I don't know what to do. Thanks for your help.

Upgrade to the latest version http://www.limewire.com/english/content/download.shtml , (sharing 100 or more files seems to help others too), watch the connections pane to see what is happening when you try to connect, and be patient--it can take a while when you first start before the network finds an ultapeer node with an open slot that can be linked to you.