Ok, I'm lost

Once you've downloaded & installed LW & LW's connected to the network (green connection bars in the bottom left corner)...you can search for files. Select the file type that you want (audio, video, all types etc) & then type the file name into the text field above the Search button. Click the Search button to start searching for the file. When you see results from your search, highlight the file you want & click Download.

You should probably read these: LimeWire FAQ and User Guide

There are heaps of infected files on the network, so be careful with your downloading. Make sure that you're using a good AV program. Keep it updated & scan every file that you download, before opening it
WARNING: Viruses on network you should be aware of!