Here are the answers

1) If you want to play in the browser you will have to stop the bot first (Actions->Stop). When you close the browser you can start the bot again (Actions->Start)
2) The bot only works when your pc is turned on. If you shut down your pc the bot will stop too.
3) No the bot will remember the queue.
4) Press the save button.
If you should have some other questions, the start post in this topic explains everything you need to know
~Uthar