To see kitchen, you have to set up Login key to Employee, how to do that, please visit here (Look at "How to set up Login Key?")
Now you can see kitchen
Here you can check meal, which you have done (), choose meal, which is in progress (), confirm the Order () and cancel (only after confirmation ())
After confirming, the waiter get a message that Order is ready (in the bottom, right side)
Here you can see information about Reservations
Here you can choose which product categories you want to see in home page of kitchen and choose the sound which inform you about new Order.