Adjust the Curl, Thickness and Color sliders to the shape/color you want. Slide the Start slider to 1 or tap the middle of the screen to start. Use the left and right arrow keys or drag your finger far to the right or left to turn the shape left and right. Use the Up and down keys or drag you finger far to the top or bottom to zoom in and out. If Curl = 0 then you can move the character around with the arrow keys or finger. Press space or tap the middle of the screen to go back to the menu and then repeat the steps again.
100% by me.