This should pretty much work the same as the Scratch costume editor, except that you can't fill or erase. Click the icons (square, text, reshape, etc.) to change the tool. Click and drag on the checkered area to use the tool. Move your mouse to the top of the screen to access the drop-down of more tools (Drag the sliders to change the color). For the text tool, use the down arrow key to backspace. If you find any bugs, please comment them and I will try to fix them.
