How to draw/sketch in SketchBook app of Samsung Galaxy Note3(SM-N900)?

a). From the Home screen, tap on Apps as shown below :

b). Tap on Galaxy Plus folder and then tap on SketchBook for Galaxy as shown below :

c). Now tap on Gallery icon to create Sketch and then select New Sketch as shown below :

d). Draw the Sketch and tap the Gallery icon to Save the content as shown below :

e). Tap on Save option, your Sketch will be saved in Gallery as shown below :