The diagram shows a one-move tsume(checkmate) problem. It's your turn. You have nothing in hand. So you will have to move one of your pieces on the board such as Bishop on 3a and Silver on 3c to checkmate the King. Which piece should you move? The answer will be found in the comment.
It's recommendable to replay the answer line using your own shogi board and pieces. If you do not have them, the following pages might be of help;
Please refer to the article about the shogi notation in Wikipedia linked below, if necessary