Can't get Chat HTML file to work on hosted page
I'm having trouble getting the realtime SDK for JS working with the default.html file I was given. I am demoing it with the chat app. When I try to type something into the chat I get a "no subscribed channels" message, but when I try to subscribe I'm getting a "subscribe send failed". This is what the interface looks like.
I'm pretty sure I followed the setup instructions for using the JS Realtime SDK. What is going wrong?