The meaning of the numbers: 
 
Min Time: The minimum time in minutes to wait to respawn one creature. 
Max Time: The maximum time in minutes to wait to respawn one creature. 
Max Dist: = The maximum distance spawned creatures are allowed to walk away from this spawnpoint. 
            0 means they are allowed to walk away unlimited far, even across the whole world. 
Amount: The maximum number of spawned creatures that will exist simulaneously at this spawn point. 
 
How to place a creature spawn: 
Select a creature from the list, fill in the desired numbers, click 'Place' to place the spawn gem, 
finally click 'Init' to initialize it. Ready.