Press "space" and click on an icon to clone it. Click and drag a clone to move it. Press "d" on an icon to delete it and press "r" to delete all clones. Press "c" and click on an icon or clone to change it's colour. Press "n" and click on a clone or icon to change the robotic part. Press the up and down arrows on a clone to layer it. Press the left and right arrow keys to move the part left or right.
Note: when you press delete it will delete anything that is under the thing that you are trying to delete.