Click and drag the appropriate jigsaw puzzle pieces, to the empty squares of your choice on the left.

To rotate a jigsaw piece, that is upside down click and drag the required piece to the "Rotate" button. The picture will straighten and go back to the square it was taken from. Then proceed as mentioned in the previous instruction.

If  you cannot solve the puzzle don't worry. Arrange all the pieces as best as you can and click on the "Solve" button.