To create a circuit, click and drag items from the Components menu on the right into the grid at the center of the screen. Items will jump to positions joining two of the grid points, so it is easy to make their ends connect. By default, items will be oriented horizontally. If you click on the Vertical button, items will appear vertical as you drag them onto the grid. If you put an item in the wrong place, left-click on it once to highlight it (denoted by red color), then click the Delete Selected button to remove it. You can remove all items at once by clicking the Clear Board button.