Controls (Keyboard | Mouse): Space | Click the center: Spin the wheel Up/Down Arrows | Scroll on the left: Change the selected slice that you are editing. C | Pencil Icon Change the name of the selected slice. X | Red X Delete the selected slice. Left/Right Arrows | Plus/Minus signs in the top right: Change the weight of the selected slice. Enter | Plus sign at the bottom left: Adds a new slice.