You are black and the computer is white. The goal is to end the game with more of your pieces on the board. Touch to place a piece. A legal move must form a line with your pieces surrounding your opponent on both sides. This turns enclosed pieces black . You go first. To place one of your pieces, just click where you want to go.
But you can only put pieces in a spot that makes a line (horizontal, vertical or diagonal) with your piece on the other side and the computer's pieces in the middle. It's like you are capturing his pieces (changing them to your color), and to capture, you have to surround them.