default login is confusing

When logging in, the login fields are pre-filled with "username" and a password...i think these are meant to be examples but they also work if you hit login. Since I (and most people) have autocomplete turned on for my browser, I didn't even look at the values in these fields, assuming it was my login info. I just hit login and then saw subscriptions that didn't match mine so it felt like I was either in someone else's account when I thought I was in mine or my sources had been all messed up. If you want to have a demo account for people to play with, that should be a very explicit flow that states "see a demo account" etc.