If it is the first time you are creating maps for Cossacks, you should become familiar with the interface.
1. Main Menu and Help Screen
2. Resource Bar and Population Information
3. Tool Bar
4. Nation Colour Selection Menu
5. Brush Radius Settings
6. Options Selecting Menu
7. Inner Brush Radius
8. Outer Brush Radius
9. Mini Map Display
For a detailed overview of all the possible hotkeys and shortcut combinations read the subpage Hotkeys.
For a detailed overview of all the possible editor codes read the subpage Codes.