^
You can just go in to watch as the live stream airs but the dumb thing about being a regular member is that you may get kicked out of the broadcast if a premium member comes in and pushes you out of your viewing spot (It's one of the main reasons why I sometimes prefer to reserve shows for timeshift and watch them later instead of viewing them live as I dislike getting interrupted in the middle). If that happens, you'll have to click the "back" button/refresh the same page to "go back into the show" so to speak. Premium members have the privilege of watching the broadcast without getting kicked out. You could say they have a "pre-reserved place" in that sense. The reservation thing is for saving the show to watch later after the live stream has ended (Usually you have to wait around 30 minutes for the archived video to become available).