The document provides instructions for customizing a virtual cube buddy in 4 steps: 1) Choosing the basic cube shape, 2) Selecting a color, 3) Choosing patterns for each side of the cube, and 4) Adding more cubes to create different shapes and a more creative buddy. Additional instructions are given for controlling the buddy through touch gestures like double tapping to make it jump or dragging with fingers to change its size or move it.