You do know that you will have to have a streaming server in order to use that application, right?
That means for starters you will need a dedicated server and a host which will allow you to install Red5 or Flash Media Server on the machine. Looking at the requirements for Web FLV Recorder:
◦WebFLVRecorder requires web server with Red5 installed.
◦We recommend that you purchase at least a VPS or semi-dedicated server for your website.
Not that any of this is impossible to do... all it takes is MONEY!
A dedicated server will be about 10 times as expensive as a shared server, and while Red5 is open source (free!), it takes somewhat of an expert to install and correctly configure it.
So before you purchase any software, be sure you understand the server requirements and have contacted your Web site host about the dedicated server part.
Best wishes,
Video Man