First select the Mixer tool. Then choose the tool option desired, then click on the drawing. Your Option key can make changes to some of the tool options. Paint Can fills the selected area with the chosen color or pattern from the Options bar. Select Paint Can.
Erasers remove all or part of the drawing in fun ways.
Erasers range from large to small. Select the Eraser tool, the size of eraser from the Option bar and erase part of the drawing. Select other options and click on the screen to watch the whole picture disappear. Try pressing your option key while erasing and see what happens. Text places letters, numbers and symbols at any place on the screen.