This is described on each plugin page from our site.
Make sure you install rtmp side as explained on:http://www.videowhisper.com/?p=RTMP+Applications
And fill rtmp address as explained there rtmp://ip-or-domain/videowhisper .

This suggests the hosting server has a connection of 100Mbps or lower (100Mbps shared) and is probably a VPS.  If there are 5 active sites on that VPS, maximum connections drops under 20 for each. 

So these can be used for some testing during development but we don't recommend VPS or budget hosting for live streaming production sites: http://www.videowhisper.com/?p=Requirements#vps ;

We recommend RTMP server running on a well connected dedicated server, preferably with 1000Mbps connection. 

Quote from VideoWhisper.com Hosting marketers plans list a maximum of 90 simultaneous users for the top plan.

This suggests the hosting server has a connection of 100Mbps or lower (100Mbps shared) and is probably a VPS.  If there are 5 active sites on that VPS, maximum connections drops under 20 for each. 

So these can be used for some testing during development but we don't recommend VPS or budget hosting for live streaming production sites: http://www.videowhisper.com/?p=Requirements#vps ;

We recommend RTMP server running on a well connected dedicated server, preferably with 1000Mbps connection. 

Absolutely 100% do not go with Video Whisperer on anything. In regards to their product, it is buggy at best out of the box. The chat room icons over lap, and you can't read the text. Ask them to fix it, and it's an "extra" charge for them to fix their own mistake. Asking them to fix something or answer a support ticket is a whole new subject of ridiculous nature.

Support tickets can go for weeks with never getting answered. I used their plugin on a clients site, and also went with their hosting, and it has been nothing but an absolute nightmare. The site has went down several times, and in doing so I was forced to use their awful ticketing system. Imagine going days with your site down, and not being able to contact anyone at all. They don't work on weekends, so forget about that too. Who offers hosting and doesn't work weekends with at least support services? Video Whisperer, that's who.

They were also hired to do some custom development work for the Video Whisper plugin on the clients site. We thought, "Who better to do the work than Video Video Whisper themselves". As it turns out, JUST ABOUT ANYONE is the final answer, because that is who they in turn hired to do the work. The work was outsourced and done very poorly. When told that it was not up to par, there was no fixing the problems, but instead excuses. We told them before hand that there was already some custom work done to the plugin. While they added new coding in, they did a complete reinstall of the plugin and wiped out all other custom development work that had been done. They said we were responsible and should have had a backup ready. As a beginning developer myself, ANY newbie developer should know they should have back up files if they are doing work to existing code. That wasn't the case for them however, and luckily are original developer did have the common sense to do it for his work. 

We had to switch billing info after the site was completed, so that the client would have full control of their site. In the process there was a mix up, and instead of a clean switch over, the site went down for a few days, and again no one gave reply.

If you are looking for a professional approach to live streaming of any sort, I 100% assure you that you will not find it in Video Whisper. I have the support tickets to prove it. 

You are saying that you used this solution, completed the site, sold the project to your client but don't want others to use it. 

Your post would be more helpful with better alternatives you used and recommend. 

Plugins is free to download an use in trial mode (with some ads and limitations) and for hosting there are multiple alternatives (if you don't want to use our turnkey services).