Choose the type of region you want from the drop down, Trigger, Fog or DayNight
Click New <type> Region. This will create a new region and switch you to the properties tab for that region.
Adjust the size of the region using the sliders, or create a group selection and click the Set to Group Select button to update the size of the region.
Selecting an existing region
Open the primary window to the Find tab
Click the Region tab. You should see a list of all regions (truncated to 100 or so)
Click the region you want. You will see it highlight in the world yellow.
Click the properties tab to edit the properties of that region
