Add/Undo/Reset

Add Biome
This will add the biome according to the settings you have specified. The biome values you specify are retained (until you change them and click the button again) for when you save your project or export the settings.
If Paint mode is selected, this does nothing; you will need to click on the map to paint each area.
Undo Last
This button will undo the last biome you created. You cannot go back more than one.
Reset All
This will clear all biomes from the map. Use this to start over.