Click on the corner where the score counter is to show/ hide it. Click on the mobile and non-mobile buttons to select them. The white arrow shows which button is selected. Click on the play button to start the game. Move the arms around to get the orange inside the red circle. When it's inside, drop it. (Trying to drop the orange when it's not inside the circle won't drop it.) Non-mobile controls: Use up and down arrow keys to select the arms. Use right and left arrow keys to turn the arm you're selected on. Press space to drop the orange. Press s to skip. Mobile controls: Use the up and down buttons on the right to select arms. Use the buttons on the left to turn the arm you're selected on. Press the button labeled "drop" to drop the orange. Press the skip button to skip. The red circle can't spawn in the area with the buttons in mobile mode.
