So I dragged a Container from Base Templates
  
  But I have no idea what the following attributes mean, or how to assign specific treasure to the chest.  
  Activation Group ID
Activation Treasure Level
Active Level Override
Amount
How do these attributes work?
Then further down, there is another section that seems to relate to the actual contents of the chest  
  What is Treasure, and Treasure Level? 
There is a number in [] , what's that for?