I can't find an obvious "begin here" spot on the page.
Your splash should also inform me whether this is a basic chat thing, phone number, or some sort of collaboration tool like GoToMeeting (now THAT would be cool).
I get the suspicious sense that you will not be able to provide your service to meet its demand with your current price structure (free still costs me time). That would keep me from even trying it because if it was any good, too many people would use it for me to get the attention I need.
That may not be the case but you have to address that concern somehow on the front page to get people to try the service to its potential.
Compare to the typical web 2.0 site - https://www.mint.com - in one glance, what they can do for me and what others are saying. And a big signup button you can't miss.
The word "register" is a huge turn-off for a lot of people. It implies filling out form after form and then getting spammed while you wait in vain for help. By all means keep the button, but maybe you should call it "get started" or something.