We’re still quite a long way from the slick, integrated experience I’ve got in mind as a long-term goal, but as of now there’s a really simple page you can go to for quick access to the Lobby and any other chat rooms you might want to create or use.
Simply head over to https://chinwag.im/webchat/ and sign in. You’ll find yourself dropped right into the Lobby and can carry on from there. I think you’ll still have the best experience with some dedicated XMPP client software, but for times when you need a quick web-based option, we’ll keep you covered.