To add a new country:

• Go to Dictionaries > Addl dictionaries > Countries
• Press the Insert or ↓ key. You can also use the Add line context menu item or the Add line item of the Edit main menu item
• Enter the numeric or alphabetic country code in the Code field
• Enter the country name in the Name field
• Save the new country using the Document > Save document main menu item or the  button on the toolbar.