Hey Holland, thanks for the reply. I'm confused right, as you can upload .jar and can choose "play in browser", I asked support and they said this, but didn't really lead on about an functionality issues with browsers.. :S
"The entry point is the package name of the class you compiled into your jar. Once you get it correct it should work on the draft page. If you're using an existing game engine then they might have a tutorial about how you would embed your game into a browser, and they'll describe what your entry point is."