On the tutorial, don't make me type "google" to click the start button. If I click "Start", that's enough. I'm generally a thorough reader and I still didn't really see that you were asking me to type "google" vs. just anything and the button gives no indication if you click it.
On the tutorial, on step 5, you say "Click RECORD" - there are two record buttons, and neither is highlighted. This is just as frustrating as the "Start" button not working in step 1.
On the tutorial, on step 7, your "Publish" button is way outside the general area all of the other interactions have been - it's not obvious what to click to continue.
I agree with all of kaolinite's comments regarding general polish of the website.
Once I actually launch the app I get two loading screens, one after the other - not a big deal, but I'd try to consolidate that if possible.
I have no Java plugin installed, so I just get "Pick which window to record" with nothing in the drop-down and no indication of what's wrong. I have to bail right here. If I were a normal user, you'd have no indication of why I abandoned.
The actual app UI looks good and looks like it could have high potential, but I can't use it.