Don't bother with the enable checkbox, unless you are interested in seeing what search terms other people are using.

I'm not sure what you mean by "download keeps saying not connected." Once downloads run out of hosts to download from, just repeat the search to find more sources (or cmd-click on the original search tab to see the option to "repeat search"). If your Connections pane doesn't show three or more connections that's a different problem.

Limewire is not a "site" --it's a networking program that allows you to share all kinds of files with other users like yourself. Just curious--what made you think it's a site?