Click on the play button (upper most) to begin. Then click on level 1. You will be shown a short tutorial on how to play the game.
Your objective is to realign these scribbles so they make drawings. You can rotate each part of the drawing by clicking on the arrow buttons on the bottom left and right of the screen. To switch between the different parts of the drawing you can rotate, click on one of the round buttons at the bottom center of the game window.
Tip: Try to get one part aligned so it makes sense, then turn to the other one and try the same.