It should automatically end the broadcast after about 10 minutes of inactivity (not resuming it). If you broadcast on May 13 and its still showing up, it's definitely a bug. We'll have a look.
Jere, Brad sent me your question. We will be adding an explicit "end" button very soon (it's definitely confusing right now). If you hit "cancel" it will kill the archive. As for the time you didn't hit cancel, I will look into it and try to figure out what happened. Thanks for letting us know!
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