left click anywhere on the canvas to create a walker
explore and play with parameters on the right sidebar
click and drag with the middle mouse button to pan the canvas
use your mousewheel to zoom in/out the canvas (only for preview when the canvas is too big or small for your screen - the real, exported size is set in the parameters)
tips
mobile devices are not supported
if you create too many walkers (20+), redrawing will slow down to prevent UI blocking - try increasing the brush size or spacing a bit if you want faster results