Adding A Region
While in the "Line", "Box" or "Magic" Tools, in the Region selection click the "+" button to add a new region.
Enter a name and description below. You can also add a color for its corresponding region button.
By clicking the colored input area you can adjust the color with this menu, courtesy of jscolor.
When you're done, click "Save". The region buttons will be automatically updated and your selection is preserved, so you can immediately update the region with the tiles you have selected.