Advantages of the Premium:

* Automatic Exploration. How to launch Automatic Exploration
* Easy view of explored squares from the Kingdom Map
* Population don't abandon buildings due to long absence of a ruler
* Population don't riot due to long absence of a ruler
* A character isn't deleted due to long absence of a ruler
* Queue of sciences. How to queue sciences
* Queue of construction and upgrade. How to queue buildings
* More mail smileys
* More messages in the Archive
* More players in the Contact List

In order to purchase the Premium: click the Treasure Chest in the bottom left panel. Being in the "Premium" tab, click "Purchase". Premium will be active for certain period of time that will be specified in the window. Premium can be prolonged any time.