Well just kinda draw... Dunno what else you need to know. Oh wait also the fill erases everything when used and only fills the backdrop with the color you are currently using, including eraser. Eraser and Grey share same backdrop.
I started off using a simple tutorial by SL Smart Mind on Youtube. Link to video: https://www.youtube.com/watch?v=_a2jXRaPeIQ I will look at comments so suggest any feature you want me to add! Tags: #ART