couple of points here:
firstly, VLC Streamer doesn't interact with your normal VLC install at all. You can install VLC and still keep VLC Streamer.
secondly - if you do want to uninstall, the simplest way is just to move the app from your applications folder to the trash. (You'll need to click on the menu icon first to quit the app).
If you want to completely delete the supporting files & preferences, then we have an uninstaller: