Just type in the search field the title of whatever it is you are looking for. The trick (or at least my trick) is to be very selective of what you select for downloading. Use certain criteria such as filetype (i.e. .avi, .mpg, .omg, .mkv) and file size (depends on how long and in what quality you expect the video to be. For example, you will never see a full size, DVD quality movie with a file size of 150Megs. It will be more like 2Gigs or something).
As you familiarise yourself with simple searching over Gnutella, you will be able to move on to the more complicated features of LW.
For that, you may look around the forums for further clues.

__________________
iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-