1. Click the grid spaces you want to be filled, the region click will help you fill it in faster.
2. Input the amount of each shape you want to be filled in the board.
3. The space that the pieces take up should equal the amount of grid spaces you filled, although the program will still try to run otherwise.
4. When you press Start the program will try to fill the board spaces with the pieces you've chosen, click on Live Solve if you want to see the board filled in real time.