Crossword Construction Kit window > Options > Preferences > Keyboard
Use the 12 hot keys provided to easily insert non-English language characters into puzzles. If these characters are not already assigned to your keyboard, this is a handy method for inserting them into the puzzle words and clues.
Click on the drop down list next to each key and select the character needed. Over 60 characters are available for use. The character selected is assigned to that hot key. When adding words and clues in the Create New Puzzle window, just press the assigned hot key to insert the character.